{"title":"Downfire Subwoofer Boxes and Enclosures","description":"\u003cdiv class=\"ai-collection-block\"\u003e\n\u003ch2\u003eWhy Down-Firing\u003c\/h2\u003e\n\u003cp\u003eDown-firing subwoofer placement does two specific things that rearward-firing doesn't. First, it uses the vehicle floor as an acoustic boundary, which loads the driver's output and produces more even bass distribution throughout the cabin. The bass arrives at the listening position from underneath rather than from a single point in the trunk, which reduces the directional cue that says \"the bass is coming from the trunk\" and produces a more enveloping, immersive bass image. Second, the cone is protected from cargo, foot traffic, and impact damage, which matters in installations where the enclosure sits in a cargo bay or under a seat where things will inevitably contact it.\u003c\/p\u003e\n\u003cp\u003eThe tradeoff is that down-firing requires specific construction. The enclosure needs rubber feet to elevate the cabinet off the floor by enough distance to let the driver's cone move freely without bottoming on the surface below. The enclosure orientation also has to be right for the driver: the driver mounts on the bottom face of the cabinet, which means the baffle is at the bottom, the terminal cup is on the side, and the wiring routes accordingly. A regular front-firing enclosure flipped upside-down doesn't work. The construction has to be designed for down-firing from the start.\u003c\/p\u003e\n\u003ch2\u003eWhen Down-Firing Is the Right Choice\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCargo-bay installs:\u003c\/strong\u003e SUV and hatchback builds where the enclosure sits in the cargo area and items get loaded on top of it (groceries, gear, dog crates, sports equipment). Down-firing protects the driver from contact damage that would destroy a front-firing enclosure within the first month of daily use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUnder-seat installs:\u003c\/strong\u003e Trucks and SUVs with available under-seat space where a low-profile enclosure can fit. Down-firing fits the orientation naturally. The driver fires through a small gap between the enclosure base and the floor below, with the seat structure above the cabinet.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOpen SUV cabins:\u003c\/strong\u003e Vehicles where the cargo area opens directly to the passenger cabin (Jeep Wranglers, older Broncos, off-road builds). Down-firing distributes bass more evenly through the open cabin than a rearward-firing enclosure can, since the open cabin layout doesn't provide the back-cabin loading that closed sedans and coupes naturally have.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStealth installs:\u003c\/strong\u003e Builds where the enclosure needs to be visually unobtrusive. A down-firing cabinet looks like a flat-topped bench or platform from above, with no visible driver cone or visible enclosure features.\u003c\/p\u003e\n\u003ch2\u003eConstruction\u003c\/h2\u003e\n\u003cp\u003eDown Fire Series cabinets are built from Langboard Elite MDF (48.5 lb\/ft³ density, 200 psi internal bond strength), the highest-grade MDF available for enclosure construction. Cabinet panels are joined using Dado and V-Groove cuts that mechanically interlock at each panel intersection before bonding, with the down-firing baffle orientation designed into the cabinet from the start rather than adapted from a front-firing template.\u003c\/p\u003e\n\u003cp\u003eEvery enclosure is CNC-cut on ShopSabre routers in our Tullahoma, Tennessee facility. Internal volume is calculated to specific Thiele-Small parameters for driver-matched configurations and to standard ranges for universal-fit applications.\u003c\/p\u003e\n\u003ch2\u003eBuild Inclusions\u003c\/h2\u003e\n\u003cp\u003eEvery Down Fire Series enclosure ships complete with polyfill (sized to the specific cabinet volume), 12 gauge OFC pre-wiring landed at the Proline X composite terminal cup, and threaded inserts pre-positioned for the driver's bolt pattern. The terminal cup is the Proline X ABS\/carbon fiber composite cup, used across the Proline X enclosure lineup, designed for clean wire termination at higher gauges than standard spring-clip cups will accept.\u003c\/p\u003e\n\u003cp\u003eRubber feet are included and essential. Down-firing requires that the cabinet sit elevated off the floor by enough distance to let the driver's cone move freely without bottoming on the surface below. The feet provide that clearance and also dampen any panel resonance that would otherwise transmit through the cabinet base to the floor of the vehicle.\u003c\/p\u003e\n\u003cp\u003eCabinet exterior finishes are available in grey trunkliner or plush black carpet, both standard finish options in the Proline X lineup.\u003c\/p\u003e\n\u003caside class=\"ai-callout-cta\"\u003e\n\u003cp class=\"ai-callout-label\"\u003eNeed Help With Your Down-Fire Build?\u003c\/p\u003e\n\u003cp\u003eTalk to an SQ-judge tech directly. We'll confirm whether down-firing is the right orientation for your install location and match you to the right enclosure for your driver.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"ai-contact-phone\"\u003e707-999-3071\u003c\/span\u003e\u003cspan class=\"ai-contact-divider\"\u003e|\u003c\/span\u003e\u003cspan class=\"ai-contact-email\"\u003econtact@audiointensity.com\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/aside\u003e\n\u003cdiv class=\"ai-faq-section\"\u003e\n\u003ch2\u003eFrequently Asked Down Fire Series Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat's the advantage of a down-firing enclosure?\u003c\/h3\u003e\n\u003cp\u003eTwo main advantages. First, the vehicle floor acts as an acoustic boundary that loads the driver's output and distributes bass more evenly throughout the cabin, producing a less directional and more enveloping bass image. Second, the driver cone is protected from cargo, foot traffic, and impact damage, which matters in cargo-bay installs where things get loaded on top of the enclosure. For daily-use cargo-area installs, down-firing is often the more practical orientation.\u003c\/p\u003e\n\u003ch3\u003eCan I just flip a regular subwoofer enclosure upside down?\u003c\/h3\u003e\n\u003cp\u003eNo. A front-firing enclosure flipped upside-down doesn't work. The cabinet needs feet to elevate the box off the floor (the driver cone will bottom on the floor without clearance), the terminal cup needs to be positioned on a side wall instead of the back, and the internal volume calculation accounts for the different acoustic behavior of down-firing vs front-firing. Down Fire Series enclosures are built specifically for the down-firing orientation from the start.\u003c\/p\u003e\n\u003ch3\u003eWill a down-firing enclosure work in any vehicle?\u003c\/h3\u003e\n\u003cp\u003eDown-firing works best in vehicles where the cargo area or install location has a relatively flat floor surface that the cabinet can sit on. SUVs, hatchbacks, and trucks with cargo bays or behind-seat areas are the typical applications. Sedans with carpeted trunks also work fine. The orientation isn't ideal for irregular surfaces, deep wheel-well intrusions, or installations where the enclosure needs to mount to a vertical surface.\u003c\/p\u003e\n\u003ch3\u003eHow much clearance do I need below the enclosure?\u003c\/h3\u003e\n\u003cp\u003eThe rubber feet provide the necessary clearance for the driver's cone movement. You don't need to add additional clearance beyond what the feet provide. The cabinet sits flat on the floor surface with the feet contacting, and the driver fires through the gap created by the feet. The carpet or surface texture beneath the enclosure doesn't significantly affect performance.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between down-firing and a regular sealed enclosure?\u003c\/h3\u003e\n\u003cp\u003eBoth produce sealed-alignment bass. The difference is the driver orientation and the resulting acoustic behavior. A regular sealed enclosure fires the driver toward the cabin (typically rearward in a trunk install), creating a directional bass source. A down-firing sealed enclosure uses the floor to redistribute the bass throughout the cabin, producing a less directional, more enveloping bass image. The cabinet construction, internal volume calculation, and tuning principles are similar; the orientation is what changes.\u003c\/p\u003e\n\u003ch3\u003eWhat size amplifier do I need?\u003c\/h3\u003e\n\u003cp\u003eThe amplifier requirement is determined by the driver, not the enclosure orientation. Match the amplifier's RMS output at your wired impedance to the driver's RMS rating. Wavtech thinPRO 12 drivers run 750W RMS. Audiomobile and Arc Audio drivers in the Down Fire Series fitments typically run 500-1000W RMS depending on the specific model. A monoblock amplifier matched to the driver's RMS rating at the final wired impedance is the standard approach.\u003c\/p\u003e\n\u003ch3\u003eWhat unique design elements separate down-firing enclosures from flipped front-firing boxes?\u003c\/h3\u003e\n\u003cp\u003eTrue down-firing cabinets are engineered from the ground up with specific structural considerations. They integrate heavy-duty rubber feet to lift the heavy enclosure body, which leaves an exact clearance gap so the moving woofer cone never impacts the vehicle floor. The internal wire routing, side terminal cup positioning, and lower baffle boards are intentionally flipped during manufacturing to preserve airtight integrity under intense acoustic loading.\u003c\/p\u003e\n\u003ch3\u003eWhich specific subwoofer models are these cabinets designed to fit?\u003c\/h3\u003e\n\u003cp\u003eThe current catalog features precision engineering cutouts tailored to premium shallow and slim-profile drivers. These configurations directly support high-performance options, including Arc Audio and Wavtech thinPRO twelve-inch subwoofers. You can select them as empty standalone cabinets or choose fully loaded systems that arrive with the subwoofers pre-installed.\u003c\/p\u003e\n\u003ch3\u003eDoes down-firing placement affect the overall bass response inside the vehicle?\u003c\/h3\u003e\n\u003cp\u003eDirecting the woofer downward changes how acoustic energy couples with your vehicle. The small gap between the enclosure baffle and your floor acts as a loading boundary, which physically amplifies output efficiency and helps smooth out harsh frequency spikes. This results in incredibly clean and evenly dispersed bass notes that blend seamlessly into your front-stage speakers.\u003c\/p\u003e\n\u003ch3\u003eWhat installation accessories come included inside the shipping box?\u003c\/h3\u003e\n\u003cp\u003eEvery unit arrives completely prepped from the factory to eliminate regular bench assembly frustration. The interior is pre-loaded with an exact volume of premium polyfill to optimize internal air mass compliance. Additionally, twelve-gauge oxygen-free copper speaker wire comes pre-installed, pre-terminated, and safely landed at our proprietary composite terminal cup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","products":[{"product_id":"audiomobile-encore-15-inch-sealed-down-firing-subwoofer-enclosure","title":"Audiomobile Encore 15 inch Sealed Down Firing Subwoofer Enclosure","description":"\u003ch2\u003eUnleash Your Encore 15: Precision Bass, Audiophile-Grade\u003c\/h2\u003e\n\u003cp\u003eThis custom-crafted sealed enclosure elevates your Audiomobile Encore 15's true potential. Experience deeper, more accurate bass with a compact footprint that preserves precious cargo space.\u003c\/p\u003e\n\u003ch3\u003eMeticulous Design for Sonic Accuracy\u003c\/h3\u003e\n\u003cul data-sourcepos=\"7:1-10:0\"\u003e\n\u003cli data-sourcepos=\"7:1-7:203\"\u003eEvery detail, from the airspace to the non-restrictive bracing, ensures a perfectly balanced soundscape for audiophile-grade performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCrafted for Discerning Listeners\u003c\/h3\u003e\n\u003cul data-sourcepos=\"7:1-10:0\"\u003e\n\u003cli data-sourcepos=\"8:1-8:138\"\u003e Superior MDF construction and a precision-cut design deliver the nuanced, hard-hitting bass that audiophiles demand.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePremium Fit and Finish\u003c\/h3\u003e\n\u003cul data-sourcepos=\"7:1-10:0\"\u003e\n\u003cli data-sourcepos=\"9:1-10:0\"\u003eSeamless subwoofer integration and a triple-faced design ensure this enclosure complements your Encore 15 visually and sonically.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cpre\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003cstrong\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;\"\u003eProduct Details:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/pre\u003e\n\u003cul\u003e\n\u003cli\u003eSingle 15\" Single Sealed Subwoofer Enclosure\u003c\/li\u003e\n\u003cli\u003eDesigned to Fit Audiomobile Encore 4415 Subwoofer (not included)\u003c\/li\u003e\n\u003cli\u003eComputer-designed enclosure and CNC cut\u003c\/li\u003e\n\u003cli\u003eProper airspace\u003c\/li\u003e\n\u003cli\u003ePremium 3\/4\" Medium Density Fiberboard (MDF) construction\u003c\/li\u003e\n\u003cli\u003eTriple Face\u003c\/li\u003e\n\u003cli\u003eFlush Mounted Sub Provision\u003c\/li\u003e\n\u003cli\u003eIncludes Rubber Feet for use in Downfiring Application\u003c\/li\u003e\n\u003cli\u003eInternally Braced\u003c\/li\u003e\n\u003cli\u003eDual Terminal Cups\u003c\/li\u003e\n\u003cli\u003eNet Box volume: 1.4 cubic feet \u003c\/li\u003e\n\u003cli\u003eDimensions: 29.5\" \u003cb\u003eW\u003c\/b\u003e x 18\" \u003cb\u003eH\u003c\/b\u003e x 8.5\" \u003cstrong\u003eD\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003e1-year Manufacturer's Warranty\u003c\/li\u003e\n\u003cli\u003eFree Shipping in the USA (Lower 48 States)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg style=\"float: none;\" alt=\"M15-S DF with Audiomobile Encore 15 optional BMW Logo\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/M15-S_DF_with_Audiomobile_Encore_15_optional_BMW_Logo_480x480.jpg?v=1722679633\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eFAQ: Audiomobile Encore 4415 Subwoofer\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWhat makes the Audiomobile Encore 4415 ideal for high-end audio systems?\u003c\/h3\u003e\n\u003cp\u003eThe Audiomobile Encore 4415 prioritizes sonic accuracy and dynamic range. Its carbon fiber dust cap, flux-stabilization rings, and ICAR heatsink ensure consistent, detailed bass reproduction, even at high volumes.\u003c\/p\u003e\n\u003ch3\u003eMy space is limited. Will the Audiomobile 15-inch still deliver powerful bass?\u003c\/h3\u003e\n\u003cp\u003eAbsolutely! This subwoofer excels in sealed enclosures as small as 1.25 cubic feet. Its high-output design and 19mm linear Xmax deliver deep, powerful bass without sacrificing cargo space.\u003c\/p\u003e\n\u003ch3\u003eIs the Audiomobile Encore 4415 built to last?\u003c\/h3\u003e\n\u003cp\u003eYes. The Audiomobile Encore 4415 features premium materials like its aluminum heatsink\/radiator for longevity. The robust motor design and \"Silver Vein\" powder-coated frame ensure years of reliable, audiophile-grade performance.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Proline X","offers":[{"title":"No Thanks - Box Only","offer_id":40988321546329,"sku":"Pro AM 15-S","price":349.99,"currency_code":"USD","in_stock":true},{"title":"Yes Add an Audiomobile Encore 4415","offer_id":40988321579097,"sku":"Pro AM 15-S Encore","price":1099.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/products\/audiomobile-encore-15-inch-sealed-down-firing-subwoofer-enclosureproline-x-383480.jpg?v=1710077440"},{"product_id":"proline-x-bronco-edition-dual-12-down-firing-sealed-subwoofer-box","title":"Proline X Bronco Edition — Dual 12\" Down-Firing Sealed Subwoofer Enclosure","description":"\u003c!-- ============================================================\n     PROLINE X VEHICLE SPECIFIC SERIES — BRONCO EDITION DUAL 12\" DOWN-FIRING\n     PRODUCT DESCRIPTION HTML\n     Color system: Electric Blue (#2563eb \/ #1e40af primary)\n     Enclosure-only SKU\n     ============================================================ --\u003e\n\n\u003cstyle\u003e\n  .vs-wrap * { box-sizing: border-box; }\n  .vs-wrap { font-family: inherit; color: #1e293b; line-height: 1.7; max-width: 1200px; }\n\n  \/* ── Hero ── *\/\n  .vs-hero {\n    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);\n    border-radius: 8px;\n    padding: 40px 36px;\n    margin-bottom: 32px;\n    position: relative;\n    overflow: hidden;\n  }\n  .vs-hero::before {\n    content: '';\n    position: absolute;\n    top: -60px;\n    right: -60px;\n    width: 260px;\n    height: 260px;\n    background: rgba(37, 99, 235, 0.12);\n    border-radius: 50%;\n  }\n  .vs-hero::after {\n    content: '';\n    position: absolute;\n    bottom: -40px;\n    right: 80px;\n    width: 160px;\n    height: 160px;\n    background: rgba(59, 130, 246, 0.08);\n    border-radius: 50%;\n  }\n  .vs-hero-badge {\n    display: inline-block;\n    background: rgba(37, 99, 235, 0.25);\n    color: #93c5fd;\n    font-size: 0.72em;\n    font-weight: 700;\n    letter-spacing: 0.12em;\n    text-transform: uppercase;\n    padding: 4px 14px;\n    border-radius: 3px;\n    border: 1px solid rgba(147, 197, 253, 0.3);\n    margin-bottom: 18px;\n  }\n  .vs-hero h2 {\n    color: #ffffff;\n    font-size: 1.85em;\n    font-weight: 800;\n    margin: 0 0 16px 0;\n    line-height: 1.2;\n  }\n  .vs-hero h2 span { color: #93c5fd; 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}\n\n  \/* ── Warranty ── *\/\n  .vs-warranty {\n    background: #0f172a;\n    border-left: 5px solid #2563eb;\n    border-radius: 0 6px 6px 0;\n    padding: 20px 28px;\n    margin: 28px 0;\n    display: flex;\n    align-items: center;\n    gap: 20px;\n  }\n  .vs-warranty-badge {\n    background: #2563eb;\n    color: #ffffff;\n    font-size: 1em;\n    font-weight: 800;\n    padding: 10px 16px;\n    border-radius: 4px;\n    white-space: nowrap;\n  }\n  .vs-warranty p { color: #cbd5e1; font-size: 0.93em; margin: 0; line-height: 1.6; }\n  .vs-warranty strong { color: #ffffff; }\n\n  \/* ── Fitment List ── *\/\n  .vs-fitment-list {\n    list-style: none;\n    margin: 14px 0 0 0;\n    padding: 0;\n    display: grid;\n    grid-template-columns: repeat(2, 1fr);\n    gap: 8px;\n  }\n  @media (max-width: 560px) { .vs-fitment-list { grid-template-columns: 1fr; } }\n  .vs-fitment-list li {\n    font-size: 0.93em;\n    color: #334155;\n    padding: 8px 12px;\n    background: #eff6ff;\n    border-left: 3px solid #2563eb;\n    border-radius: 0 4px 4px 0;\n  }\n\n  .vs-divider { border: none; border-top: 1px solid #e2e8f0; margin: 32px 0; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"vs-wrap\"\u003e\n\n  \u003c!-- HERO --\u003e\n  \u003cdiv class=\"vs-hero\"\u003e\n    \u003cspan class=\"vs-hero-badge\"\u003eVehicle Specific Series | Bronco Edition | Enclosure Only\u003c\/span\u003e\n    \u003ch2\u003eDual 12\". \u003cspan\u003eDown-Firing.\u003c\/span\u003e\u003cbr\u003eBuilt for the 6th-Gen Bronco.\u003c\/h2\u003e\n    \u003cp\u003eThe Proline X Bronco Edition is a dual 12\" sealed enclosure engineered specifically for the 6th-generation Ford Bronco cargo area. \u003cstrong\u003eDown-firing orientation puts the drivers on the floor, keeps the top surface flat and functional, and uses ground-coupling to load the drivers acoustically.\u003c\/strong\u003e CNC-cut in Tennessee from Langboard Elite MDF. Pre-wired 12g OFC. Feet included. Drop it in, wire it up, and load gear on top.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FITMENT ALERT --\u003e\n  \u003cdiv class=\"vs-fitment-alert\"\u003e\n    \u003cspan class=\"vs-fitment-alert-icon\"\u003eFitment\u003c\/span\u003e\n    \u003cp\u003e\u003cstrong\u003eDesigned for 6th-generation Ford Bronco (2021–2025), 2-door and 4-door.\u003c\/strong\u003e This enclosure sits in the cargo area without factory mounting point integration. Confirm your available cargo dimensions and woofer mounting depth (8\" max) and cutout diameter (11.25\") before ordering.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- SECTION: Down-Firing --\u003e\n  \u003cdiv class=\"vs-section\"\u003e\n    \u003ch3\u003eDown-Firing Is Not a Compromise — It's a Design Decision\u003c\/h3\u003e\n    \u003cp\u003eDown-firing subwoofer placement uses the vehicle's floor surface as an acoustic boundary. When a driver fires into a hard, reflective surface at close range, the floor acts as a passive radiating plane — loading the driver and reinforcing bass output across the low-frequency range. The result is deeper, fuller low-end than the same driver firing into open air in a standard orientation.\u003c\/p\u003e\n    \u003cp\u003eThe secondary function is practical. With both drivers facing down, the top surface of the enclosure is flat, unobstructed, and load-bearing. Gear goes on top. The subwoofers are protected from cargo contact. You don't give up the Bronco's cargo utility to run a real audio system.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- WHY CARDS --\u003e\n  \u003cdiv class=\"vs-card-grid\"\u003e\n\n    \u003cdiv class=\"vs-card\"\u003e\n      \u003cspan class=\"vs-card-label\"\u003eAcoustic\u003c\/span\u003e\n      \u003ch4\u003eGround-Coupling Loads Both Drivers Simultaneously\u003c\/h4\u003e\n      \u003cdiv class=\"vs-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eDown-firing position places both drivers within inches of the Bronco's cargo floor. The floor acts as an acoustic boundary that loads both woofers simultaneously — reinforcing output and producing a broader, more even low-frequency response than a rear-firing or up-firing configuration in the same space.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"vs-card\"\u003e\n      \u003cspan class=\"vs-card-label\"\u003eAcoustic\u003c\/span\u003e\n      \u003ch4\u003ePolyfill Pre-Installed at the Factory\u003c\/h4\u003e\n      \u003cdiv class=\"vs-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eBoth sealed chambers ship with polyfill pre-installed. Polyfill acoustically extends the effective internal volume, improving low-frequency extension without increasing box size. \u003cstrong\u003eFactory installation ensures consistent packing density\u003c\/strong\u003e on every unit — not left to the installer to approximate in the field.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"vs-card\"\u003e\n      \u003cspan class=\"vs-card-label\"\u003eConstruction\u003c\/span\u003e\n      \u003ch4\u003eDado and V-Cut Joinery — No Butt Joints\u003c\/h4\u003e\n      \u003cdiv class=\"vs-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eEvery panel joint is machined with interlocking dado and V-cut geometry. The panels register mechanically before adhesive is applied, eliminating the gap variance that butt-jointed construction allows. \u003cstrong\u003eMechanical registration produces a tighter acoustic seal\u003c\/strong\u003e and a structurally stiffer assembly than surface-bonded panels.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"vs-card\"\u003e\n      \u003cspan class=\"vs-card-label\"\u003eConstruction\u003c\/span\u003e\n      \u003ch4\u003eInternal Bracing — Single-Layer Face, Rigidity by Structure\u003c\/h4\u003e\n      \u003cdiv class=\"vs-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe face panel is single-layer Langboard Elite MDF with internal bracing placed at span intervals to control panel flex under excursion load. Bracing transfers the mechanical energy of the drivers into the enclosure structure rather than allowing it to flex the baffle — keeping the acoustic seal intact at real power levels.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"vs-card\"\u003e\n      \u003cspan class=\"vs-card-label\"\u003eWiring\u003c\/span\u003e\n      \u003ch4\u003ePre-Wired 12g OFC — Ready to Connect\u003c\/h4\u003e\n      \u003cdiv class=\"vs-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eInternal wiring is 12-gauge oxygen-free copper, terminated at the Proline X terminal cup and pre-run to the woofer cutouts before shipping. \u003cstrong\u003ePull the leads, connect your drivers, done.\u003c\/strong\u003e No internal wiring work required at install. OFC construction eliminates the resistive loss and long-term oxidation that CCA wiring introduces.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"vs-card\"\u003e\n      \u003cspan class=\"vs-card-label\"\u003eMaterial\u003c\/span\u003e\n      \u003ch4\u003eLangboard Elite MDF — Published Mill Data, Not Marketing Language\u003c\/h4\u003e\n      \u003cdiv class=\"vs-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eLangboard Elite is a named, sourced, mill-documented panel product with published density, internal bond, and screw-holding specifications. \u003cstrong\u003e200 psi internal bond. 325 lb face screw holding.\u003c\/strong\u003e This is the same panel stock used across the full Proline X lineup — not a generic \"premium MDF\" designation with no verifiable spec behind it.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"vs-card\"\u003e\n      \u003cspan class=\"vs-card-label\"\u003eUniversal Fit\u003c\/span\u003e\n      \u003ch4\u003eUniversal Woofer Application — No Threaded Inserts\u003c\/h4\u003e\n      \u003cdiv class=\"vs-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe baffle is cut for universal 12\" mounting — \u003cstrong\u003e11.25\" cutout, 8\" max mounting depth\u003c\/strong\u003e. No threaded inserts means no proprietary bolt pattern to match. Mount any compliant 12\" driver with standard hardware. Pair with whatever woofer fits your power level and budget — Audiomobile, Crescendo, Image Dynamics, or your preferred brand.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"vs-card\"\u003e\n      \u003cspan class=\"vs-card-label\"\u003ePractical\u003c\/span\u003e\n      \u003ch4\u003eFeet Included — Proper Clearance Out of the Box\u003c\/h4\u003e\n      \u003cdiv class=\"vs-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eFeet are included and installed before shipment. They set the correct standoff distance between the enclosure and the Bronco's cargo floor — enough clearance for the drivers to fire and pressurize the floor boundary without bottoming out. \u003cstrong\u003eNo improvised spacers, no field modifications required.\u003c\/strong\u003e\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003chr class=\"vs-divider\"\u003e\n\n  \u003c!-- SECTION: Construction --\u003e\n  \u003cdiv class=\"vs-section\"\u003e\n    \u003ch3\u003eBuilt in Tennessee on ShopSabre CNC Routers\u003c\/h3\u003e\n    \u003cp\u003eEvery Proline X Vehicle Specific enclosure is CNC-cut and hand-assembled in Tullahoma, Tennessee. Panels are machined on ShopSabre CNC routers — dado depth, V-cut geometry, cutout diameter, and external dimensions are held to spec on every unit. Internal volume is not approximated. It is calculated, programmed, and cut. The enclosure that ships to you performs to the same spec as the one used to develop the product.\u003c\/p\u003e\n    \u003cp\u003eFinished in plush black automotive carpet. Every unit is inspected before shipment.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- SECTION: Fitment --\u003e\n  \u003cdiv class=\"vs-section\"\u003e\n    \u003ch3\u003eVehicle Fitment\u003c\/h3\u003e\n    \u003cul class=\"vs-fitment-list\"\u003e\n      \u003cli\u003e2021 Ford Bronco — 2-Door\u003c\/li\u003e\n      \u003cli\u003e2021 Ford Bronco — 4-Door\u003c\/li\u003e\n      \u003cli\u003e2022 Ford Bronco — 2-Door\u003c\/li\u003e\n      \u003cli\u003e2022 Ford Bronco — 4-Door\u003c\/li\u003e\n      \u003cli\u003e2023 Ford Bronco — 2-Door\u003c\/li\u003e\n      \u003cli\u003e2023 Ford Bronco — 4-Door\u003c\/li\u003e\n      \u003cli\u003e2024 Ford Bronco — 2-Door\u003c\/li\u003e\n      \u003cli\u003e2024 Ford Bronco — 4-Door\u003c\/li\u003e\n      \u003cli\u003e2025 Ford Bronco — 2-Door\u003c\/li\u003e\n      \u003cli\u003e2025 Ford Bronco — 4-Door\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp style=\"margin-top: 14px; font-size: 0.9em; color: #64748b;\"\u003eAll trim levels. Enclosure sits in cargo area — no factory mounting point integration. Confirm available cargo dimensions before ordering.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- WARRANTY --\u003e\n  \u003cdiv class=\"vs-warranty\"\u003e\n    \u003cdiv class=\"vs-warranty-badge\"\u003e2-Year Warranty\u003c\/div\u003e\n    \u003cp\u003e\u003cstrong\u003eAll Proline X Vehicle Specific Series enclosures are covered by a two-year manufacturer's warranty\u003c\/strong\u003e against defects in materials and workmanship. Built and inspected in our Tennessee facility. Contact Audio Intensity directly for warranty support.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Version Bronco 1","offer_id":42385618174041,"sku":"VS FDB 12D-S DF-1","price":499.99,"currency_code":"USD","in_stock":true},{"title":"Version Bronco 2","offer_id":42385618206809,"sku":"VS FDB 12D-S DF-2","price":499.99,"currency_code":"USD","in_stock":true},{"title":"Version Bronco 3","offer_id":42385618239577,"sku":"VS FDB 12D-S DF-3","price":499.99,"currency_code":"USD","in_stock":true},{"title":"Version 4 - I'll Provide My Artwork","offer_id":42385618272345,"sku":"VS FDB 12D-S DF-4","price":549.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-bronco-edition-dual-12-down-firing-sealed-subwoofer-boxsubwoofer-enclosuresproline-x-817201.jpg?v=1761970522"},{"product_id":"performance-optimized-down-fire-sealed-10-dual-enclosure-audiomobile-gt2","title":"Performance Optimized Down Fire Sealed 10\" Dual Enclosure | Audiomobile GT2","description":"\u003cdiv class=\"podf-wrap\"\u003e\n\u003cstyle\u003e\n.podf-wrap{font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif;line-height:1.7;color:#cbd5e1 !important;}\n.podf-wrap p{color:#cbd5e1 !important;margin:0 0 14px 0;}\n.podf-wrap ul{margin:0 0 16px 0;padding-left:20px;}\n.podf-wrap li{color:#cbd5e1 !important;margin-bottom:8px;}\n.podf-wrap strong{color:#67e8f9 !important;}\n.podf-wrap a{color:#22d3ee !important;font-weight:700;text-decoration:underline;}\n.podf-hero{background:linear-gradient(135deg,#0f172a 0%,#0e7490 100%) !important;border-radius:8px;padding:32px 28px;margin-bottom:28px;}\n.podf-eyebrow{display:inline-block;color:#67e8f9 !important;font-size:0.72em;font-weight:700;letter-spacing:0.14em;text-transform:uppercase;margin-bottom:10px;}\n.podf-hero h2{color:#ffffff !important;font-size:1.55em;font-weight:700;margin:0 0 12px 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class=\"podf-hero\"\u003e\n\u003cspan class=\"podf-eyebrow\"\u003eProline X | Performance Optimized Down Fire\u003c\/span\u003e\n\u003ch2\u003eTwo Audiomobile GT2 2010s. Eight and a Half Inches Tall. Firing Into the Floor.\u003c\/h2\u003e\n\u003cp\u003eA sealed dual 10 enclosure cut to the Audiomobile GT2 2010 and nothing else. The drivers face down, the cargo floor stays flat and usable, and the cabinet clears rear deck lines that a conventional dual 10 box cannot get near.\u003c\/p\u003e\n\u003cdiv class=\"podf-badges\"\u003e\n\u003cspan class=\"podf-badge\"\u003e1.20 CU FT NET\u003c\/span\u003e\n\u003cspan class=\"podf-badge\"\u003e8.5 IN TALL CABINET\u003c\/span\u003e\n\u003cspan class=\"podf-badge\"\u003eDOWN FIRE OR FORWARD FIRE\u003c\/span\u003e\n\u003cspan class=\"podf-badge\"\u003eFEET INCLUDED\u003c\/span\u003e\n\u003cspan class=\"podf-badge\"\u003eBUILT IN TULLAHOMA, TN\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-section\"\u003e\n\u003ch3\u003eBuilt for One Driver, Not for a Size Class\u003c\/h3\u003e\n\u003cp\u003ePerformance Optimized enclosures are engineered around a specific subwoofer. This one is cut to the \u003cstrong\u003eAudiomobile GT2 2010\u003c\/strong\u003e, a 10 inch driver with 400 watts RMS of power handling, 11.9mm of one way Xmax, and only 4.25 inches of mounting depth. Those numbers are unusual together, and they are what make a cabinet this shallow possible in the first place.\u003c\/p\u003e\n\u003cp\u003eThe GT2 2010 asks for a small chamber. Audiomobile's own minimum sealed figure is 0.50 cubic feet. This enclosure gives each driver \u003cstrong\u003e0.60 cubic feet of net airspace in a common chamber\u003c\/strong\u003e, which sits comfortably inside the driver's working range while keeping the cabinet down to 8.5 inches of external height. The cutouts are 9.2 inches, matched to the driver's gasket ID, and the mounting pattern comes from the actual driver rather than a spec sheet.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-section-alt\"\u003e\n\u003ch3\u003eWhy Down Fire\u003c\/h3\u003e\n\u003cp\u003eTurning the drivers toward the floor is not a styling decision. It changes what the enclosure does to the space around it and what the space around it can do to the enclosure.\u003c\/p\u003e\n\u003cdiv class=\"podf-card-grid\"\u003e\n\u003cdiv class=\"podf-card\"\u003e\n\u003cspan class=\"podf-card-label\"\u003eBoundary\u003c\/span\u003e\u003cdiv class=\"podf-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eThe Floor Is Right There\u003c\/h4\u003e\n\u003cp\u003eThe drivers radiate into a hard surface 1.75 inches away. In a trunk or cargo area that reinforcement, combined with cabin gain, is what makes a compact sealed box feel bigger than its airspace.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"podf-card\"\u003e\n\u003cspan class=\"podf-card-label\"\u003eProtection\u003c\/span\u003e\u003cdiv class=\"podf-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eNothing Lands on the Cone\u003c\/h4\u003e\n\u003cp\u003eGroceries, tools, luggage, and dogs never touch a surround that is facing down. The most common cause of a damaged subwoofer in a daily driven vehicle is \u003cstrong\u003ecargo, not power\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"podf-card\"\u003e\n\u003cspan class=\"podf-card-label\"\u003ePackaging\u003c\/span\u003e\u003cdiv class=\"podf-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eA Flat Top You Can Use\u003c\/h4\u003e\n\u003cp\u003eNo baskets, no grilles, no protrusions. The top of the cabinet is a flat carpeted surface, which in most vehicles means you get the cargo floor back instead of building around a box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"podf-card\"\u003e\n\u003cspan class=\"podf-card-label\"\u003eFlexibility\u003c\/span\u003e\u003cdiv class=\"podf-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eNot Locked Into One Orientation\u003c\/h4\u003e\n\u003cp\u003eThe feet ship without predrilled holes on purpose. Mount them where your floor wants them, or leave them off entirely and run the cabinet \u003cstrong\u003eforward firing\u003c\/strong\u003e if your install calls for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-clearance\"\u003e\n\u003cspan class=\"podf-clearance-label\"\u003eFeet and Clearance\u003c\/span\u003e\n\u003ch3\u003eWhat Ships With the Enclosure\u003c\/h3\u003e\n\u003cp\u003eFour feet come standard with every Performance Optimized Down Fire enclosure. There is no upgrade tier and no separate accessory to buy.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eABS and carbon fiber composite\u003c\/strong\u003e, machined in house on the same equipment as our terminal cups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.75 inches of lift\u003c\/strong\u003e, which sets the working air gap between the baffle and the floor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo predrilled mounting holes\u003c\/strong\u003e, so the enclosure is never locked into a single orientation. Set them where they suit your floor, or omit them and run forward firing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall height with feet installed: 10.25 inches.\u003c\/strong\u003e Cabinet alone is 8.5 inches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"podf-alert\"\u003e\u003cp\u003e\u003cstrong\u003eKeep the gap clear.\u003c\/strong\u003e The 1.75 inch space under the baffle is the air path, not empty room. A spare tire, a toolbox, or a folded moving blanket pressed against the opening will choke the output. Down fire systems that sound dead almost always have something jammed underneath them.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-section\"\u003e\n\u003ch3\u003eBefore You Buy: Read the Impedance\u003c\/h3\u003e\n\u003cp\u003eThe GT2 2010 runs a \u003cstrong\u003esingle 3 ohm nominal voice coil at 2.8 ohms DCR\u003c\/strong\u003e. This is not a standard car audio impedance and there is no dual 2 ohm or dual 4 ohm version of the driver. Two of them in this enclosure give you exactly two options.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallel, 1.5 ohms nominal.\u003c\/strong\u003e Requires a 1 ohm stable monoblock. An amplifier in the 800 to 1000 watt RMS range is the clean match and the configuration we recommend.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries, 6 ohms nominal.\u003c\/strong\u003e Most amplifiers will drive 6 ohms, but output falls to roughly 40 to 50 percent of the 1 ohm rating. This is the path when your amplifier is not 1 ohm stable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSettle the amplifier question before the enclosure ships. It is the single decision that determines what this system is capable of.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-section-alt\"\u003e\n\u003ch3\u003eHow It Is Built\u003c\/h3\u003e\n\u003cdiv class=\"podf-highlight\"\u003e\n\u003ch3\u003eCabinet\u003c\/h3\u003e\n\u003cp\u003eCut on our ShopSabre CNC from Langboard Elite MDF and assembled with V groove and dado joinery, with internal bracing and a \u003cstrong\u003edouble baffle\u003c\/strong\u003e at 1.5 inches. Every panel meets on a machined joint rather than a butt seam, so the cabinet stays rigid and puts its energy into the drivers instead of the panels. Internal height under the top panel is 6.25 inches against the driver's 4.25 inch mounting depth, so the motors clear with room to breathe.\u003c\/p\u003e\n\u003ch3\u003eMounting Pattern Drawn In House\u003c\/h3\u003e\n\u003cp\u003eWe have the GT2 2010 in the shop. We measured it, built the bolt circle in CAD, and the nutsert locations and the cutout are machined in the same operation from the same origin on the router. \u003cstrong\u003eThe holes cannot drift relative to each other, because the machine never re-references between them.\u003c\/strong\u003e Threaded inserts are installed and 8\/32 machine screws are supplied, so the drivers can come out and go back in as many times as the build requires.\u003c\/p\u003e\n\u003ch3\u003eWiring and Damping\u003c\/h3\u003e\n\u003cp\u003eThe Proline X ABS and carbon fiber composite terminal cup is \u003cstrong\u003eside mounted\u003c\/strong\u003e, which keeps the connection accessible with the enclosure sitting on its feet. Pre wired with 12 gauge OFC to both driver positions. Polyfill is installed before the enclosure leaves the shop.\u003c\/p\u003e\n\u003ch3\u003eFinish\u003c\/h3\u003e\n\u003cp\u003eCharcoal gray trunk liner standard, plush black available. The lasered acrylic badge mounts on the front face rather than the woofer face, so it stays visible in the down fire orientation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-section\"\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eExternal dimensions are \u003cstrong\u003e29.5 inches wide by 8.5 inches tall by 16 inches deep\u003c\/strong\u003e, or 10.25 inches tall with the feet installed. The 8.5 inch cabinet height clears the rear deck line on most full size sedans and sits under most cargo covers.\u003c\/p\u003e\n\u003cdiv class=\"podf-alert\"\u003e\u003cp\u003e\u003cstrong\u003eMeasure the width first.\u003c\/strong\u003e At 29.5 inches this is a full width enclosure. Height is the spec that makes this design interesting, but width is the spec that decides whether it goes in your vehicle. There is no compact or behind seat version of this enclosure.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-section\"\u003e\n\u003ch3\u003eEnclosure Performance\u003c\/h3\u003e\n\u003cp\u003eEvery Proline X enclosure is designed to a target alignment rather than a convenient box size. These are the sealed alignment figures for the Audiomobile GT2 2010 across the usable volume range, calculated from the published Thiele-Small parameters: Fs 27.5 Hz, Qts 0.61, Vas 1.17 cu ft.\u003c\/p\u003e\n\u003ctable class=\"podf-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eVolume Per Driver\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e0.50 cu ft (minimum)\u003c\/td\u003e\n\u003ctd\u003e1.115\u003c\/td\u003e\n\u003ctd\u003e50.3 Hz\u003c\/td\u003e\n\u003ctd\u003e37.9 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e0.60 cu ft (this enclosure)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e1.048\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e47.2 Hz\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e36.4 Hz\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e0.75 cu ft (maximum practical)\u003c\/td\u003e\n\u003ctd\u003e0.976\u003c\/td\u003e\n\u003ctd\u003e44.0 Hz\u003c\/td\u003e\n\u003ctd\u003e35.0 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cdiv class=\"podf-chartbox\"\u003e\n\u003csvg class=\"podf-chart\" width=\"1260\" height=\"420\" viewbox=\"0 0 1260 420\" preserveaspectratio=\"xMidYMid meet\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"display:block !important;width:100% !important;max-width:100% !important;height:auto !important;\"\u003e\n\u003crect x=\"0\" y=\"0\" width=\"1260\" height=\"420\" fill=\"#0b1424\"\u003e\u003c\/rect\u003e\n\u003crect x=\"90\" y=\"50\" width=\"1080\" height=\"300\" fill=\"#111c30\" stroke=\"#2c405c\" stroke-width=\"1\"\u003e\u003c\/rect\u003e\n\u003cline x1=\"280\" y1=\"50\" x2=\"280\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"520\" y1=\"50\" x2=\"520\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"845\" y1=\"50\" x2=\"845\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"90\" y1=\"105\" x2=\"1170\" y2=\"105\" stroke=\"#334155\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"90\" y1=\"145\" x2=\"1170\" y2=\"145\" stroke=\"#64748b\" stroke-width=\"1\" stroke-dasharray=\"6,5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"1178\" y=\"150\" font-size=\"15\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-3 dB\u003c\/text\u003e\n\u003ctext x=\"1178\" y=\"110\" font-size=\"15\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e0 dB\u003c\/text\u003e\n\u003cpolyline points=\"90,312 112,300 135,287 158,275 180,262 202,250 225,237 248,224 270,212 292,199 315,186 338,173 360,161 382,149 405,138 428,127 450,117 472,107 495,100 518,93 540,88 562,84 585,81 608,79 630,78 653,78 675,79 698,80 720,81 742,82 765,84 788,85 810,86 832,88 855,89 878,90 900,91 922,93 945,94 968,94 990,95 1012,96 1035,97 1058,98 1080,98 1102,99 1125,99 1148,100 1170,100\" fill=\"none\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\u003cpolyline points=\"90,281 112,269 135,257 158,245 180,233 202,221 225,209 248,197 270,185 292,174 315,163 338,152 360,142 382,133 405,124 428,117 450,110 472,104 495,100 518,96 540,93 562,92 585,90 608,90 630,89 653,89 675,90 698,90 720,91 742,92 765,92 788,93 810,94 832,95 855,95 878,96 900,97 922,97 945,98 968,99 990,99 1012,100 1035,100 1058,100 1080,101 1102,101 1125,101 1148,102 1170,102\" fill=\"none\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\u003cpolyline points=\"90,298 112,285 135,273 158,261 180,248 202,236 225,223 248,211 270,198 292,186 315,174 338,162 360,151 382,140 405,130 428,120 450,112 472,105 495,99 518,94 540,90 562,87 585,85 608,84 630,84 653,84 675,84 698,85 720,86 742,87 765,88 788,89 810,90 832,91 855,92 878,93 900,94 922,95 945,96 968,97 990,97 1012,98 1035,98 1058,99 1080,99 1102,100 1125,100 1148,101 1170,101\" fill=\"none\" stroke=\"#22d3ee\" stroke-width=\"4.5\"\u003e\u003c\/polyline\u003e\n\u003ctext x=\"82\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e20\u003c\/text\u003e\n\u003ctext x=\"272\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e30\u003c\/text\u003e\n\u003ctext x=\"512\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e50\u003c\/text\u003e\n\u003ctext x=\"833\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e100\u003c\/text\u003e\n\u003ctext x=\"1158\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e200\u003c\/text\u003e\n\u003ctext x=\"560\" y=\"404\" font-size=\"17\" fill=\"#22d3ee\" font-family=\"sans-serif\" font-weight=\"700\"\u003eFrequency (Hz)\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"56\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e+4\u003c\/text\u003e\n\u003ctext x=\"58\" y=\"178\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-5\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"246\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-10\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"314\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-15\u003c\/text\u003e\n\u003ctext x=\"102\" y=\"36\" font-size=\"16\" fill=\"#67e8f9\" font-family=\"sans-serif\" font-weight=\"700\"\u003eAnechoic half-space response, no cabin gain\u003c\/text\u003e\n\u003cline x1=\"880\" y1=\"270\" x2=\"930\" y2=\"270\" stroke=\"#22d3ee\" stroke-width=\"4.5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"942\" y=\"276\" font-size=\"16\" fill=\"#e2e8f0\" font-family=\"sans-serif\" font-weight=\"700\"\u003e0.60 cu ft, this enclosure\u003c\/text\u003e\n\u003cline x1=\"880\" y1=\"302\" x2=\"930\" y2=\"302\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"942\" y=\"308\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e0.50 and 0.75 cu ft\u003c\/text\u003e\n\u003c\/svg\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-alert\"\u003e\u003cp\u003e\u003cstrong\u003eRead the curve honestly.\u003c\/strong\u003e The GT2 2010 has a Qts of 0.61, which means it cannot reach a textbook 0.707 Qtc in any enclosure that fits in a vehicle. You would need 3.41 cu ft per driver. At 0.60 cu ft this alignment lands at Qtc 1.048, which puts a roughly 1.5 dB lift around 47 Hz and an anechoic F3 of 36.4 Hz. That is an impact alignment, not a flat one. Loaded into a trunk or cargo floor and firing down, cabin gain fills in below the knee and the result is a punchy, high output system. If you want a flat sealed alignment above all else, this is not the driver or the enclosure for it.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003eRun your own numbers with the \u003ca href=\"\/pages\/sealed-box-calculator\"\u003eSealed Box Calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-section\"\u003e\n\u003cp\u003eFull dimensions, cutout, mounting depth, and hardware details are listed under the \u003cstrong\u003eEnclosures\u003c\/strong\u003e tab.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"podf-cta\"\u003e\n\u003ch3\u003eCut for the GT2 2010. Built in Tennessee.\u003c\/h3\u003e\n\u003cp\u003eOrder it as a bare enclosure or loaded with a matched pair of Audiomobile GT2 2010 subwoofers, wired and ready to connect. Every Performance Optimized Down Fire enclosure is built to order in Tullahoma, Tennessee. Questions on fitment or amplifier matching, call or text 707-999-3071.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Plush Black \/ Box Only","offer_id":44389901303897,"sku":"PO 10D-S DF AM-BLK-BO","price":279.99,"currency_code":"USD","in_stock":true},{"title":"Plush Black \/ Loaded with two Audiomobile GT2 2010","offer_id":44389901336665,"sku":"PO 10D-S DF AM-BLK-LD","price":579.99,"currency_code":"USD","in_stock":true},{"title":"Grey \/ Box Only","offer_id":44389901238361,"sku":"PO 10D-S DF AM-GRY-BO","price":269.99,"currency_code":"USD","in_stock":true},{"title":"Grey \/ Loaded with two Audiomobile GT2 2010","offer_id":44389901271129,"sku":"PO 10D-S DF AM-GRY-LD","price":569.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/PDF10D-SAMFront.png?v=1785798600"},{"product_id":"proline-x-p10-s-df-single-10-sealed-down-fire-subwoofer-enclosure","title":"Proline X P10-S DF | Single 10\" Sealed Down Fire Subwoofer Enclosure","description":"\u003cdiv class=\"df-wrap\"\u003e\n\u003cstyle\u003e\n.df-wrap{font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif;line-height:1.7;color:#cbd5e1 !important;}\n.df-wrap p{color:#cbd5e1 !important;margin:0 0 14px 0;}\n.df-wrap ul{margin:0 0 16px 0;padding-left:20px;}\n.df-wrap li{color:#cbd5e1 !important;margin-bottom:8px;}\n.df-wrap strong{color:#67e8f9 !important;}\n.df-wrap a{color:#22d3ee !important;font-weight:700;text-decoration:underline;}\n.df-hero{background:linear-gradient(135deg,#0f172a 0%,#0e7490 100%) !important;border-radius:8px;padding:32px 28px;margin-bottom:28px;}\n.df-eyebrow{display:inline-block;color:#67e8f9 !important;font-size:0.72em;font-weight:700;letter-spacing:0.14em;text-transform:uppercase;margin-bottom:10px;}\n.df-hero h2{color:#ffffff !important;font-size:1.55em;font-weight:700;margin:0 0 12px 0;line-height:1.3;}\n.df-hero p{color:#e2e8f0 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!important;border-radius:8px;padding:22px 24px;margin:28px 0;}\n.df-clearance-label{display:inline-block;background:#06b6d4 !important;color:#04222b !important;font-size:0.68em;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;padding:4px 11px;border-radius:3px;margin-bottom:12px;}\n.df-clearance h3{margin-top:0;}\n.df-card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:24px 0;}\n@media(max-width:600px){.df-card-grid{grid-template-columns:1fr;}}\n.df-card{background:#1a2740 !important;border:1px solid #2c405c !important;border-top:3px solid #06b6d4 !important;border-radius:6px;padding:22px;}\n.df-card-label{display:inline-block;background:#06b6d4 !important;color:#04222b !important;font-size:0.68em;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;padding:3px 10px;border-radius:3px;margin-bottom:10px;}\n.df-card h4{margin:0 0 10px 0;}\n.df-card-divider{height:2px;background:#06b6d4 !important;width:32px;margin-bottom:12px;border-radius:2px;}\n.df-card p{font-size:0.93em;color:#b6c4d6 !important;margin:0;line-height:1.65;}\n.df-card p strong{color:#67e8f9 !important;}\n.df-table{width:100% !important;border-collapse:collapse;margin:22px 0;font-size:0.94em;}\n.df-table th{background:#0e7490 !important;color:#ffffff !important;text-align:left;padding:11px 14px;font-weight:700;font-size:0.9em;letter-spacing:0.04em;text-transform:uppercase;border-bottom:1px solid #22384f !important;}\n.df-table td{padding:10px 14px;border-bottom:1px solid #22384f !important;color:#dbe4ef !important;background:#111c30 !important;}\n.df-table tr:nth-child(even) td{background:#1a2740 !important;}\n.df-table td:first-child{font-weight:600;color:#67e8f9 !important;width:34%;}\n.df-chartbox{display:block !important;width:100% !important;max-width:100% !important;margin:22px 0 !important;}\n.df-chart{display:block !important;width:100% !important;max-width:100% !important;height:auto !important;}\n.df-cta{background:linear-gradient(135deg,#0f172a 0%,#0e7490 100%) !important;border-radius:8px;padding:28px 26px;margin:32px 0 0 0;text-align:center;}\n.df-cta h3{color:#ffffff !important;margin:0 0 10px 0;}\n.df-cta p{color:#e2e8f0 !important;margin:0;font-size:0.97em;}\n.df-cta a{color:#a5f3fc !important;}\n\u003c\/style\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n\u003cspan class=\"df-eyebrow\"\u003eProline X | Performance Down Fire\u003c\/span\u003e\n\u003ch2\u003eFive and a Half Inches Tall. Firing Into the Floor.\u003c\/h2\u003e\n\u003cp\u003eA shallow sealed enclosure for a single 10 inch subwoofer, built to disappear under a cargo cover or behind a seat back. The driver faces down, the top of the cabinet stays flat and usable, and the whole thing stands 7.25 inches tall with the feet installed.\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003e0.60 CU FT NET\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003e5.5 IN CABINET\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003e4.75 IN MAX DEPTH\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003eDOWN FIRE OR FORWARD FIRE\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003eFEET INCLUDED\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003eBUILT IN TULLAHOMA, TN\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-warn\"\u003e\n\u003cspan class=\"df-warn-label\"\u003eRead This First\u003c\/span\u003e\n\u003ch3\u003eThis Is a Shallow Mount Enclosure\u003c\/h3\u003e\n\u003cp\u003eMaximum driver mounting depth is \u003cstrong\u003e4.75 inches\u003c\/strong\u003e. That is the number that decides whether this enclosure works for you, and it rules out the majority of conventional 10 inch subwoofers, which typically need somewhere between 5.5 and 7 inches.\u003c\/p\u003e\n\u003cp\u003eThis box is built for \u003cstrong\u003eshallow mount and slim profile 10s\u003c\/strong\u003e. Check your driver's published mounting depth against 4.75 inches before you order. If your driver needs more than that, our forward fire P10-S allows 6.25 inches and is the better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around a Constraint, Not Around a Driver\u003c\/h3\u003e\n\u003cp\u003ePerformance Down Fire enclosures are sized by driver diameter rather than cut for one specific subwoofer. This one takes any 10 inch driver with a \u003cstrong\u003e9.25 inch cutout\u003c\/strong\u003e and a mounting depth of 4.75 inches or less, and gives it \u003cstrong\u003e0.60 cubic feet of net airspace\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe design brief was height. At 5.5 inches of cabinet the enclosure fits places a conventional 10 inch box cannot go, and turning the driver toward the floor is what makes that height possible, because the baffle no longer has to face outward into the cargo area.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section-alt\"\u003e\n\u003ch3\u003eWhy Down Fire\u003c\/h3\u003e\n\u003cp\u003eTurning the driver toward the floor is not a styling decision. It changes what the enclosure does to the space around it and what the space around it can do to the enclosure.\u003c\/p\u003e\n\u003cdiv class=\"df-card-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003eBoundary\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eThe Floor Is Right There\u003c\/h4\u003e\n\u003cp\u003eThe driver radiates into a hard surface 1.75 inches away. In a trunk or cargo area that reinforcement, combined with cabin gain, is what makes a compact sealed box feel bigger than its airspace.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003eProtection\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eNothing Lands on the Cone\u003c\/h4\u003e\n\u003cp\u003eGroceries, tools, luggage, and dogs never touch a surround that is facing down. The most common cause of a damaged subwoofer in a daily driven vehicle is \u003cstrong\u003ecargo, not power\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003ePackaging\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eA Flat Top You Can Use\u003c\/h4\u003e\n\u003cp\u003eNo basket, no grille, no protrusion. The top of the cabinet is a flat carpeted surface, which in most vehicles means you get the cargo floor back instead of building around a box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003eFlexibility\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eNot Locked Into One Orientation\u003c\/h4\u003e\n\u003cp\u003eThe feet ship without predrilled holes on purpose. Mount them where your floor wants them, or leave them off entirely and run the cabinet \u003cstrong\u003eforward firing\u003c\/strong\u003e if your install calls for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-clearance\"\u003e\n\u003cspan class=\"df-clearance-label\"\u003eFeet and Clearance\u003c\/span\u003e\n\u003ch3\u003eWhat Ships With the Enclosure\u003c\/h3\u003e\n\u003cp\u003eFour feet come standard with every Performance Down Fire enclosure. There is no upgrade tier and no separate accessory to buy.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eABS and carbon fiber composite\u003c\/strong\u003e, machined in house on the same equipment as our terminal cups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.75 inches of lift\u003c\/strong\u003e, which sets the working air gap between the baffle and the floor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo predrilled mounting holes\u003c\/strong\u003e, so the enclosure is never locked into a single orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall height with feet installed: 7.25 inches.\u003c\/strong\u003e Cabinet alone is 5.5 inches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"df-alert\"\u003e\u003cp\u003e\u003cstrong\u003eKeep the gap clear.\u003c\/strong\u003e The 1.75 inch space under the baffle is the air path, not empty room. A spare tire, a toolbox, or a folded moving blanket pressed against the opening will choke the output. Down fire systems that sound dead almost always have something jammed underneath them.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section-alt\"\u003e\n\u003ch3\u003eHow It Is Built\u003c\/h3\u003e\n\u003cdiv class=\"df-highlight\"\u003e\n\u003ch3\u003eCabinet\u003c\/h3\u003e\n\u003cp\u003eCut on our ShopSabre CNC from Langboard Elite MDF and assembled with V groove and dado joinery, with internal bracing and a single 0.75 inch baffle. Every panel meets on a machined joint rather than a butt seam, so the cabinet stays rigid and puts its energy into the driver instead of the panels.\u003c\/p\u003e\n\u003ch3\u003eMounting Hardware\u003c\/h3\u003e\n\u003cp\u003eThis is a generic enclosure sized by driver diameter, which means we do not know which subwoofer is going into it and cannot machine a bolt pattern for it. \u003cstrong\u003eThe baffle ships as a solid mounting flange and you drill your own mounting holes to match your driver.\u003c\/strong\u003e Threaded inserts are a feature of our Performance Optimized line, where the enclosure is cut for one named subwoofer and the bolt circle is drawn in CAD from the actual driver.\u003c\/p\u003e\n\u003cp\u003eThe MDF we use is dense. \u003cstrong\u003ePredrill your mounting holes.\u003c\/strong\u003e Driving screws straight into it without a pilot hole will split the baffle or strip the screw.\u003c\/p\u003e\n\u003ch3\u003eWiring and Damping\u003c\/h3\u003e\n\u003cp\u003eThe Proline X ABS and carbon fiber composite terminal cup is \u003cstrong\u003eside mounted\u003c\/strong\u003e, which keeps the connection accessible with the enclosure sitting on its feet. Pre wired with 12 gauge OFC. Polyfill is installed before the enclosure leaves the shop.\u003c\/p\u003e\n\u003ch3\u003eFinish\u003c\/h3\u003e\n\u003cp\u003eDark gray trunk liner standard, plush black available. The lasered acrylic badge mounts on the front face rather than the woofer face, so it stays visible in the down fire orientation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e24.5 inches wide by 13.5 inches deep by 5.5 inches tall\u003c\/strong\u003e, or 7.25 inches tall with the feet installed and the enclosure sitting in the down fire position.\u003c\/p\u003e\n\u003cdiv class=\"df-alert\"\u003e\u003cp\u003e\u003cstrong\u003eTwo numbers decide this purchase.\u003c\/strong\u003e Driver mounting depth against 4.75 inches, and cabinet height against the space you have. Width and depth are generous because the height had to come from somewhere. Measure the footprint before you order.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eEnclosure Performance\u003c\/h3\u003e\n\u003cp\u003eThis enclosure is sized by driver diameter rather than cut for one subwoofer, so there is no single response curve for it. What the alignment does depends entirely on the driver you put in, and specifically on its total Q.\u003c\/p\u003e\n\u003cp\u003eThe table below models three driver profiles across the range you find in shallow mount 10s, calculated in 0.60 cubic feet. \u003cstrong\u003eThese are illustrative profiles, not published specifications for any particular subwoofer.\u003c\/strong\u003e Use them to understand the shape of the outcome, then run your own driver's real numbers.\u003c\/p\u003e\n\u003ctable class=\"df-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver Profile (modeled)\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003cth\u003eResult\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow Q, Qts 0.40\u003cbr\u003e\u003cspan style=\"color:#94a3b8 !important;font-weight:400;font-size:0.9em;\"\u003eFs 32 Hz, Vas 0.70 cu ft\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.589\u003c\/td\u003e\n\u003ctd\u003e47.1 Hz\u003c\/td\u003e\n\u003ctd\u003e58.4 Hz\u003c\/td\u003e\n\u003ctd\u003eOverdamped. Rolls off early, thin on the bottom.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\n\u003cstrong style=\"color:#86efac !important;\"\u003eMid Q, Qts 0.50\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#86efac !important;font-weight:400;font-size:0.9em;\"\u003eFs 30 Hz, Vas 0.85 cu ft\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e0.777\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e46.6 Hz\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e42.8 Hz\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003eNear textbook. The target for this box.\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Q, Qts 0.65\u003cbr\u003e\u003cspan style=\"color:#94a3b8 !important;font-weight:400;font-size:0.9em;\"\u003eFs 28 Hz, Vas 1.00 cu ft\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd\u003e1.061\u003c\/td\u003e\n\u003ctd\u003e45.7 Hz\u003c\/td\u003e\n\u003ctd\u003e35.1 Hz\u003c\/td\u003e\n\u003ctd\u003eImpact alignment. Lift around 45 Hz, extends lower.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cdiv class=\"df-chartbox\"\u003e\n\u003csvg class=\"df-chart\" width=\"1260\" height=\"420\" viewbox=\"0 0 1260 420\" preserveaspectratio=\"xMidYMid meet\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"display:block !important;width:100% !important;max-width:100% !important;height:auto !important;\"\u003e\n\u003crect x=\"0\" y=\"0\" width=\"1260\" height=\"420\" fill=\"#0b1424\"\u003e\u003c\/rect\u003e\n\u003crect x=\"90\" y=\"50\" width=\"1080\" height=\"300\" fill=\"#111c30\" stroke=\"#2c405c\" stroke-width=\"1\"\u003e\u003c\/rect\u003e\n\u003cline x1=\"280\" y1=\"50\" x2=\"280\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"520\" y1=\"50\" x2=\"520\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"845\" y1=\"50\" x2=\"845\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"90\" y1=\"110\" x2=\"1170\" y2=\"110\" stroke=\"#334155\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"90\" y1=\"155\" x2=\"1170\" y2=\"155\" stroke=\"#64748b\" stroke-width=\"1\" stroke-dasharray=\"6,5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"1178\" y=\"160\" font-size=\"15\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-3 dB\u003c\/text\u003e\n\u003ctext x=\"1178\" y=\"115\" font-size=\"15\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e0 dB\u003c\/text\u003e\n\u003cpolyline points=\"90,345 112,333 135,322 158,311 180,300 202,290 225,279 247,269 270,259 292,250 315,240 337,231 360,223 382,214 405,206 428,198 450,191 472,184 495,178 518,172 540,167 562,161 585,157 608,152 630,148 652,145 675,141 698,138 720,135 742,133 765,131 787,129 810,127 832,125 855,124 877,122 900,121 923,120 945,119 968,118 990,117 1012,117 1035,116 1058,115 1080,115 1102,114 1125,114 1147,114 1170,113\" fill=\"none\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\u003cpolyline points=\"90,313 112,299 135,285 158,272 180,258 202,244 225,230 247,217 270,203 292,190 315,177 337,164 360,151 382,140 405,129 428,119 450,111 472,104 495,98 518,93 540,90 562,88 585,86 608,86 630,86 652,87 675,87 698,88 720,90 742,91 765,92 787,93 810,95 832,96 855,97 877,98 900,99 923,100 945,101 968,102 990,102 1012,103 1035,104 1058,104 1080,105 1102,105 1125,106 1147,106 1170,106\" fill=\"none\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\u003cpolyline points=\"90,328 112,316 135,304 158,291 180,279 202,267 225,255 247,243 270,232 292,221 315,210 337,199 360,189 382,179 405,170 428,162 450,154 472,147 495,141 518,135 540,130 562,126 585,122 608,119 630,117 652,115 675,113 698,112 720,111 742,110 765,109 787,109 810,108 832,108 855,108 877,108 900,108 923,108 945,108 968,108 990,108 1012,108 1035,108 1058,109 1080,109 1102,109 1125,109 1147,109 1170,109\" fill=\"none\" stroke=\"#22d3ee\" stroke-width=\"4.5\"\u003e\u003c\/polyline\u003e\n\u003ctext x=\"82\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e20\u003c\/text\u003e\n\u003ctext x=\"272\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e30\u003c\/text\u003e\n\u003ctext x=\"512\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e50\u003c\/text\u003e\n\u003ctext x=\"833\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e100\u003c\/text\u003e\n\u003ctext x=\"1158\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e200\u003c\/text\u003e\n\u003ctext x=\"560\" y=\"404\" font-size=\"17\" fill=\"#22d3ee\" font-family=\"sans-serif\" font-weight=\"700\"\u003eFrequency (Hz)\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"56\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e+4\u003c\/text\u003e\n\u003ctext x=\"58\" y=\"190\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-5\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"265\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-10\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"340\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-15\u003c\/text\u003e\n\u003ctext x=\"102\" y=\"36\" font-size=\"16\" fill=\"#67e8f9\" font-family=\"sans-serif\" font-weight=\"700\"\u003eModeled in 0.60 cu ft. Anechoic half-space, no cabin gain.\u003c\/text\u003e\n\u003cline x1=\"820\" y1=\"270\" x2=\"870\" y2=\"270\" stroke=\"#22d3ee\" stroke-width=\"4.5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"882\" y=\"276\" font-size=\"16\" fill=\"#e2e8f0\" font-family=\"sans-serif\" font-weight=\"700\"\u003eMid Q, Qts 0.50\u003c\/text\u003e\n\u003cline x1=\"820\" y1=\"302\" x2=\"870\" y2=\"302\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"882\" y=\"308\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003eLow Q 0.40 and High Q 0.65\u003c\/text\u003e\n\u003c\/svg\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-alert\"\u003e\u003cp\u003e\u003cstrong\u003eWhat the numbers are telling you.\u003c\/strong\u003e A 0.60 cubic foot sealed box wants a driver in the middle of the Q range. Drop in a low Q driver and you get an overdamped alignment that gives up real low end. Drop in a high Q driver and you get a lift in the upper bass with deeper extension, which is a legitimate choice if impact is what you want. There is no wrong answer here, but there is a wrong assumption, which is that any 10 will behave the same way in this box.\u003c\/p\u003e\u003c\/div\u003e\n\n\u003ch4\u003eAbout the Polyfill\u003c\/h4\u003e\n\u003cp\u003eThe 0.60 cubic foot figure is \u003cstrong\u003ephysical net airspace\u003c\/strong\u003e, measured after subtracting bracing and typical driver displacement. It is the number to enter into a modeling program. Polyfill is installed at the correct density before the enclosure ships, which typically makes a sealed box behave as though it were roughly 10 to 15 percent larger. We quote the physical volume rather than the effective one, so the number you see is the number you can verify.\u003c\/p\u003e\n\u003cp\u003eRun your own driver's parameters through the \u003ca href=\"\/pages\/sealed-box-calculator\"\u003eSealed Box Calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003cp\u003eFull dimensions, cutout, mounting depth, and hardware details are listed under the \u003cstrong\u003eEnclosures\u003c\/strong\u003e tab.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-cta\"\u003e\n\u003ch3\u003eShallow, Down Firing, Built in Tennessee.\u003c\/h3\u003e\n\u003cp\u003eEvery Performance Down Fire enclosure is built to order in Tullahoma, Tennessee on our own CNC equipment. Questions on driver depth or whether your subwoofer suits this alignment, call or text 707-999-3071.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Dark Gray Trunkliner","offer_id":44465466966105,"sku":"P10-S DF-GRY","price":169.99,"currency_code":"USD","in_stock":true},{"title":"Plush Black","offer_id":44465466998873,"sku":"P10-S DF-BLK","price":179.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/P10-SDF.png?v=1785896062"},{"product_id":"proline-x-p12-s-df-single-12-sealed-down-fire-subwoofer-enclosure","title":"Proline X P12-S DF | Single 12\" Sealed Down Fire Subwoofer Enclosure","description":"\u003cdiv class=\"df-wrap\"\u003e\n\u003cstyle\u003e\n.df-wrap{font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif;line-height:1.7;color:#cbd5e1 !important;}\n.df-wrap p{color:#cbd5e1 !important;margin:0 0 14px 0;}\n.df-wrap ul{margin:0 0 16px 0;padding-left:20px;}\n.df-wrap li{color:#cbd5e1 !important;margin-bottom:8px;}\n.df-wrap strong{color:#67e8f9 !important;}\n.df-wrap a{color:#22d3ee !important;font-weight:700;text-decoration:underline;}\n.df-hero{background:linear-gradient(135deg,#0f172a 0%,#0e7490 100%) !important;border-radius:8px;padding:32px 28px;margin-bottom:28px;}\n.df-eyebrow{display:inline-block;color:#67e8f9 !important;font-size:0.72em;font-weight:700;letter-spacing:0.14em;text-transform:uppercase;margin-bottom:10px;}\n.df-hero h2{color:#ffffff !important;font-size:1.55em;font-weight:700;margin:0 0 12px 0;line-height:1.3;}\n.df-hero p{color:#e2e8f0 !important;font-size:1.02em;margin:0;}\n.df-badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}\n.df-badge{display:inline-block;background:rgba(6,182,212,0.18) !important;border:1px solid #06b6d4 !important;color:#a5f3fc !important;font-size:0.75em;font-weight:600;letter-spacing:0.04em;padding:5px 12px;border-radius:4px;}\n.df-section{margin:30px 0;}\n.df-section-alt{background:#111c30 !important;border:1px solid #22384f !important;border-radius:8px;padding:26px 24px;margin:30px 0;}\n.df-wrap h3{color:#22d3ee !important;font-size:1.22em;font-weight:700;margin:0 0 14px 0;line-height:1.35;}\n.df-wrap h4{color:#22d3ee !important;font-size:1.02em;font-weight:700;margin:0 0 10px 0;}\n.df-highlight{background:#0f172a !important;border-left:4px solid #06b6d4 !important;padding:20px 22px;margin:28px 0;border-radius:0 6px 6px 0;}\n.df-highlight h3{color:#22d3ee !important;margin:0 0 10px 0;font-size:1.1em;}\n.df-highlight h3+h3{margin-top:18px;}\n.df-highlight p{margin-bottom:10px;font-size:0.97em;color:#cbd5e1 !important;}\n.df-highlight p:last-child{margin-bottom:0;}\n.df-alert{background:#0b2b34 !important;border:1px solid #06b6d4 !important;border-radius:6px;padding:14px 18px;margin:22px 0;font-size:0.93em;}\n.df-alert p{color:#a5f3fc !important;margin:0;}\n.df-alert strong{color:#67e8f9 !important;}\n.df-warn{background:#2b1a0b 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h3{margin-top:0;}\n.df-card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:24px 0;}\n@media(max-width:600px){.df-card-grid{grid-template-columns:1fr;}}\n.df-card{background:#1a2740 !important;border:1px solid #2c405c !important;border-top:3px solid #06b6d4 !important;border-radius:6px;padding:22px;}\n.df-card-label{display:inline-block;background:#06b6d4 !important;color:#04222b !important;font-size:0.68em;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;padding:3px 10px;border-radius:3px;margin-bottom:10px;}\n.df-card h4{margin:0 0 10px 0;}\n.df-card-divider{height:2px;background:#06b6d4 !important;width:32px;margin-bottom:12px;border-radius:2px;}\n.df-card p{font-size:0.93em;color:#b6c4d6 !important;margin:0;line-height:1.65;}\n.df-card p strong{color:#67e8f9 !important;}\n.df-table{width:100% !important;border-collapse:collapse;margin:22px 0;font-size:0.94em;}\n.df-table th{background:#0e7490 !important;color:#ffffff !important;text-align:left;padding:11px 14px;font-weight:700;font-size:0.9em;letter-spacing:0.04em;text-transform:uppercase;border-bottom:1px solid #22384f !important;}\n.df-table td{padding:10px 14px;border-bottom:1px solid #22384f !important;color:#dbe4ef !important;background:#111c30 !important;}\n.df-table tr:nth-child(even) td{background:#1a2740 !important;}\n.df-table td:first-child{font-weight:600;color:#67e8f9 !important;width:34%;}\n.df-chartbox{display:block !important;width:100% !important;max-width:100% !important;margin:22px 0 !important;}\n.df-chart{display:block !important;width:100% !important;max-width:100% !important;height:auto !important;}\n.df-cta{background:linear-gradient(135deg,#0f172a 0%,#0e7490 100%) !important;border-radius:8px;padding:28px 26px;margin:32px 0 0 0;text-align:center;}\n.df-cta h3{color:#ffffff !important;margin:0 0 10px 0;}\n.df-cta p{color:#e2e8f0 !important;margin:0;font-size:0.97em;}\n.df-cta a{color:#a5f3fc !important;}\n\u003c\/style\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n\u003cspan class=\"df-eyebrow\"\u003eProline X | Performance Down Fire\u003c\/span\u003e\n\u003ch2\u003eA Full Cubic Foot for a 12, Under Seven Inches Tall.\u003c\/h2\u003e\n\u003cp\u003eA shallow sealed enclosure for a single 12 inch subwoofer. The driver faces down, the top of the cabinet stays flat and usable, and the whole thing stands 8.5 inches tall with the feet installed. Most 12 inch boxes that hold this much air are twice this height.\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003e1.00 CU FT NET\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003e6.75 IN CABINET\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003e6 IN MAX DEPTH\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003eDOWN FIRE OR FORWARD FIRE\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003eFEET INCLUDED\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003eBUILT IN TULLAHOMA, TN\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-warn\"\u003e\n\u003cspan class=\"df-warn-label\"\u003eRead This First\u003c\/span\u003e\n\u003ch3\u003eCheck Your Driver Depth\u003c\/h3\u003e\n\u003cp\u003eMaximum driver mounting depth is \u003cstrong\u003e6 inches\u003c\/strong\u003e. That is workable for a good number of 12s, but plenty of high excursion 12 inch drivers need 7 inches or more, and those will not fit.\u003c\/p\u003e\n\u003cp\u003eCheck your driver's published mounting depth against 6 inches before you order. If it needs more, our forward fire P12-S is the better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around a Constraint, Not Around a Driver\u003c\/h3\u003e\n\u003cp\u003ePerformance Down Fire enclosures are sized by driver diameter rather than cut for one specific subwoofer. This one takes any 12 inch driver with an \u003cstrong\u003e11.13 inch cutout\u003c\/strong\u003e and a mounting depth of 6 inches or less, and gives it \u003cstrong\u003e1.00 cubic foot of net airspace\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe design brief was height. Getting a full cubic foot into a 6.75 inch cabinet means the footprint has to grow, which is why this enclosure is 29.5 inches wide. Turning the driver toward the floor is what makes the height possible, because the baffle no longer has to face outward into the cargo area.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section-alt\"\u003e\n\u003ch3\u003eWhy Down Fire\u003c\/h3\u003e\n\u003cp\u003eTurning the driver toward the floor is not a styling decision. It changes what the enclosure does to the space around it and what the space around it can do to the enclosure.\u003c\/p\u003e\n\u003cdiv class=\"df-card-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003eBoundary\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eThe Floor Is Right There\u003c\/h4\u003e\n\u003cp\u003eThe driver radiates into a hard surface 1.75 inches away. In a trunk or cargo area that reinforcement, combined with cabin gain, is what makes a compact sealed box feel bigger than its airspace.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003eProtection\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eNothing Lands on the Cone\u003c\/h4\u003e\n\u003cp\u003eGroceries, tools, luggage, and dogs never touch a surround that is facing down. The most common cause of a damaged subwoofer in a daily driven vehicle is \u003cstrong\u003ecargo, not power\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003ePackaging\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eA Flat Top You Can Use\u003c\/h4\u003e\n\u003cp\u003eNo basket, no grille, no protrusion. The top of the cabinet is a flat carpeted surface, which in most vehicles means you get the cargo floor back instead of building around a box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003eFlexibility\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eNot Locked Into One Orientation\u003c\/h4\u003e\n\u003cp\u003eThe feet ship without predrilled holes on purpose. Mount them where your floor wants them, or leave them off entirely and run the cabinet \u003cstrong\u003eforward firing\u003c\/strong\u003e if your install calls for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-clearance\"\u003e\n\u003cspan class=\"df-clearance-label\"\u003eFeet and Clearance\u003c\/span\u003e\n\u003ch3\u003eWhat Ships With the Enclosure\u003c\/h3\u003e\n\u003cp\u003eFour feet come standard with every Performance Down Fire enclosure. There is no upgrade tier and no separate accessory to buy.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eABS and carbon fiber composite\u003c\/strong\u003e, machined in house on the same equipment as our terminal cups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.75 inches of lift\u003c\/strong\u003e, which sets the working air gap between the baffle and the floor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo predrilled mounting holes\u003c\/strong\u003e, so the enclosure is never locked into a single orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall height with feet installed: 8.5 inches.\u003c\/strong\u003e Cabinet alone is 6.75 inches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"df-alert\"\u003e\u003cp\u003e\u003cstrong\u003eKeep the gap clear.\u003c\/strong\u003e The 1.75 inch space under the baffle is the air path, not empty room. A spare tire, a toolbox, or a folded moving blanket pressed against the opening will choke the output. Down fire systems that sound dead almost always have something jammed underneath them.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section-alt\"\u003e\n\u003ch3\u003eHow It Is Built\u003c\/h3\u003e\n\u003cdiv class=\"df-highlight\"\u003e\n\u003ch3\u003eCabinet\u003c\/h3\u003e\n\u003cp\u003eCut on our ShopSabre CNC from Langboard Elite MDF and assembled with V groove and dado joinery, with internal bracing and a single 0.75 inch baffle. Every panel meets on a machined joint rather than a butt seam, so the cabinet stays rigid and puts its energy into the driver instead of the panels.\u003c\/p\u003e\n\u003ch3\u003eMounting Hardware\u003c\/h3\u003e\n\u003cp\u003eThis is a generic enclosure sized by driver diameter, which means we do not know which subwoofer is going into it and cannot machine a bolt pattern for it. \u003cstrong\u003eThe baffle ships as a solid mounting flange and you drill your own mounting holes to match your driver.\u003c\/strong\u003e Threaded inserts are a feature of our Performance Optimized line, where the enclosure is cut for one named subwoofer and the bolt circle is drawn in CAD from the actual driver.\u003c\/p\u003e\n\u003cp\u003eThe MDF we use is dense. \u003cstrong\u003ePredrill your mounting holes.\u003c\/strong\u003e Driving screws straight into it without a pilot hole will split the baffle or strip the screw.\u003c\/p\u003e\n\u003ch3\u003eWiring and Damping\u003c\/h3\u003e\n\u003cp\u003eThe Proline X ABS and carbon fiber composite terminal cup is \u003cstrong\u003eside mounted\u003c\/strong\u003e, which keeps the connection accessible with the enclosure sitting on its feet. Pre wired with 12 gauge OFC. Polyfill is installed before the enclosure leaves the shop.\u003c\/p\u003e\n\u003ch3\u003eFinish\u003c\/h3\u003e\n\u003cp\u003eDark gray trunk liner standard, plush black available. The lasered acrylic badge mounts on the front face rather than the woofer face, so it stays visible in the down fire orientation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e29.5 inches wide by 14.5 inches deep by 6.75 inches tall\u003c\/strong\u003e, or 8.5 inches tall with the feet installed and the enclosure sitting in the down fire position.\u003c\/p\u003e\n\u003cdiv class=\"df-alert\"\u003e\u003cp\u003e\u003cstrong\u003eMeasure the width first.\u003c\/strong\u003e At 29.5 inches this is a full width enclosure, and that width is the price of getting a full cubic foot into a cabinet under 7 inches tall. Height is the spec that makes this design interesting, but width is the spec that decides whether it goes in your vehicle.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eEnclosure Performance\u003c\/h3\u003e\n\u003cp\u003eThis enclosure is sized by driver diameter rather than cut for one subwoofer, so there is no single response curve for it. What the alignment does depends entirely on the driver you put in, and specifically on its total Q.\u003c\/p\u003e\n\u003cp\u003eThe table below models three driver profiles across the range you find in 12 inch subwoofers, calculated in 1.00 cubic foot. \u003cstrong\u003eThese are illustrative profiles, not published specifications for any particular subwoofer.\u003c\/strong\u003e Use them to understand the shape of the outcome, then run your own driver's real numbers.\u003c\/p\u003e\n\u003ctable class=\"df-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver Profile (modeled)\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003cth\u003eResult\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow Q, Qts 0.40\u003cbr\u003e\u003cspan style=\"color:#94a3b8 !important;font-weight:400;font-size:0.9em;\"\u003eFs 30 Hz, Vas 1.30 cu ft\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.607\u003c\/td\u003e\n\u003ctd\u003e45.5 Hz\u003c\/td\u003e\n\u003ctd\u003e54.2 Hz\u003c\/td\u003e\n\u003ctd\u003eOverdamped. Rolls off early, thin on the bottom.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\n\u003cstrong style=\"color:#86efac !important;\"\u003eMid Q, Qts 0.50\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#86efac !important;font-weight:400;font-size:0.9em;\"\u003eFs 28 Hz, Vas 1.55 cu ft\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e0.798\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e44.7 Hz\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e40.2 Hz\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003eNear textbook. The target for this box.\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Q, Qts 0.65\u003cbr\u003e\u003cspan style=\"color:#94a3b8 !important;font-weight:400;font-size:0.9em;\"\u003eFs 26 Hz, Vas 1.80 cu ft\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd\u003e1.088\u003c\/td\u003e\n\u003ctd\u003e43.5 Hz\u003c\/td\u003e\n\u003ctd\u003e33.1 Hz\u003c\/td\u003e\n\u003ctd\u003eImpact alignment. Lift around 43 Hz, extends lower.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cdiv class=\"df-chartbox\"\u003e\n\u003csvg class=\"df-chart\" width=\"1260\" height=\"420\" viewbox=\"0 0 1260 420\" preserveaspectratio=\"xMidYMid meet\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"display:block !important;width:100% !important;max-width:100% !important;height:auto !important;\"\u003e\n\u003crect x=\"0\" y=\"0\" width=\"1260\" height=\"420\" fill=\"#0b1424\"\u003e\u003c\/rect\u003e\n\u003crect x=\"90\" y=\"50\" width=\"1080\" height=\"300\" fill=\"#111c30\" stroke=\"#2c405c\" stroke-width=\"1\"\u003e\u003c\/rect\u003e\n\u003cline x1=\"280\" y1=\"50\" x2=\"280\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"520\" y1=\"50\" x2=\"520\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"845\" y1=\"50\" x2=\"845\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"90\" y1=\"110\" x2=\"1170\" y2=\"110\" stroke=\"#334155\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"90\" y1=\"155\" x2=\"1170\" y2=\"155\" stroke=\"#64748b\" stroke-width=\"1\" stroke-dasharray=\"6,5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"1178\" y=\"160\" font-size=\"15\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-3 dB\u003c\/text\u003e\n\u003ctext x=\"1178\" y=\"115\" font-size=\"15\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e0 dB\u003c\/text\u003e\n\u003cpolyline points=\"90,335 112,323 135,312 158,301 180,290 202,280 225,269 247,259 270,249 292,240 315,230 337,221 360,213 382,205 405,197 428,189 450,182 472,176 495,170 518,164 540,159 562,154 585,150 608,146 630,142 652,139 675,136 698,133 720,131 742,129 765,127 787,125 810,123 832,122 855,121 877,120 900,119 923,118 945,117 968,116 990,116 1012,115 1035,115 1058,114 1080,114 1102,113 1125,113 1147,113 1170,113\" fill=\"none\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\u003cpolyline points=\"90,298 112,284 135,270 158,257 180,243 202,229 225,215 247,201 270,187 292,174 315,161 337,149 360,137 382,126 405,116 428,108 450,100 472,94 495,90 518,87 540,85 562,84 585,84 608,84 630,85 652,86 675,87 698,88 720,90 742,91 765,92 787,94 810,95 832,96 855,97 877,98 900,99 923,100 945,101 968,102 990,103 1012,103 1035,104 1058,104 1080,105 1102,105 1125,106 1147,106 1170,106\" fill=\"none\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\u003cpolyline points=\"90,317 112,304 135,292 158,279 180,267 202,255 225,243 247,231 270,220 292,208 315,198 337,187 360,177 382,168 405,160 428,152 450,144 472,138 495,132 518,127 540,123 562,120 585,117 608,114 630,112 652,111 675,110 698,109 720,108 742,108 765,107 787,107 810,107 832,107 855,107 877,107 900,107 923,107 945,107 968,108 990,108 1012,108 1035,108 1058,108 1080,108 1102,108 1125,109 1147,109 1170,109\" fill=\"none\" stroke=\"#22d3ee\" stroke-width=\"4.5\"\u003e\u003c\/polyline\u003e\n\u003ctext x=\"82\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e20\u003c\/text\u003e\n\u003ctext x=\"272\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e30\u003c\/text\u003e\n\u003ctext x=\"512\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e50\u003c\/text\u003e\n\u003ctext x=\"833\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e100\u003c\/text\u003e\n\u003ctext x=\"1158\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e200\u003c\/text\u003e\n\u003ctext x=\"560\" y=\"404\" font-size=\"17\" fill=\"#22d3ee\" font-family=\"sans-serif\" font-weight=\"700\"\u003eFrequency (Hz)\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"56\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e+4\u003c\/text\u003e\n\u003ctext x=\"58\" y=\"190\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-5\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"265\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-10\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"340\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-15\u003c\/text\u003e\n\u003ctext x=\"102\" y=\"36\" font-size=\"16\" fill=\"#67e8f9\" font-family=\"sans-serif\" font-weight=\"700\"\u003eModeled in 1.00 cu ft. Anechoic half-space, no cabin gain.\u003c\/text\u003e\n\u003cline x1=\"820\" y1=\"270\" x2=\"870\" y2=\"270\" stroke=\"#22d3ee\" stroke-width=\"4.5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"882\" y=\"276\" font-size=\"16\" fill=\"#e2e8f0\" font-family=\"sans-serif\" font-weight=\"700\"\u003eMid Q, Qts 0.50\u003c\/text\u003e\n\u003cline x1=\"820\" y1=\"302\" x2=\"870\" y2=\"302\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"882\" y=\"308\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003eLow Q 0.40 and High Q 0.65\u003c\/text\u003e\n\u003c\/svg\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-alert\"\u003e\u003cp\u003e\u003cstrong\u003eWhat the numbers are telling you.\u003c\/strong\u003e A 1.00 cubic foot sealed box wants a 12 in the middle of the Q range. Drop in a low Q driver and you get an overdamped alignment that gives up real low end. Drop in a high Q driver and you get a lift in the upper bass with deeper extension, which is a legitimate choice if impact is what you want. There is no wrong answer here, but there is a wrong assumption, which is that any 12 will behave the same way in this box.\u003c\/p\u003e\u003c\/div\u003e\n\n\u003ch4\u003eAbout the Polyfill\u003c\/h4\u003e\n\u003cp\u003eThe 1.00 cubic foot figure is \u003cstrong\u003ephysical net airspace\u003c\/strong\u003e, measured after subtracting bracing and typical driver displacement. It is the number to enter into a modeling program. Polyfill is installed at the correct density before the enclosure ships, which typically makes a sealed box behave as though it were roughly 10 to 15 percent larger, so this cabinet tends to act like 1.10 to 1.15 cubic feet in practice. We quote the physical volume rather than the effective one, so the number you see is the number you can verify.\u003c\/p\u003e\n\u003cp\u003eRun your own driver's parameters through the \u003ca href=\"\/pages\/sealed-box-calculator\"\u003eSealed Box Calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003cp\u003eFull dimensions, cutout, mounting depth, and hardware details are listed under the \u003cstrong\u003eEnclosures\u003c\/strong\u003e tab.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-cta\"\u003e\n\u003ch3\u003eShallow, Down Firing, Built in Tennessee.\u003c\/h3\u003e\n\u003cp\u003eEvery Performance Down Fire enclosure is built to order in Tullahoma, Tennessee on our own CNC equipment. Questions on driver depth or whether your subwoofer suits this alignment, call or text 707-999-3071.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Dark Gray Trunkliner","offer_id":44465486233689,"sku":"P12-S DF-GRY","price":179.99,"currency_code":"USD","in_stock":true},{"title":"Plush Black","offer_id":44465486266457,"sku":"P12-S DF-BLK","price":189.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/P12-SDF.png?v=1785896216"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/collections\/proline-x-downfire-series-enclosures-8594584.webp?v=1779354931","url":"https:\/\/audiointensity.com\/collections\/downfire-subwoofer-box.oembed","provider":"Audio Intensity","version":"1.0","type":"link"}