{"title":"Proline X Micro Series Subwoofer Boxes | JL Audio","description":"\u003cdiv class=\"ai-collection-grid\"\u003e\n\n  \u003cdiv class=\"ai-block\"\u003e\n    \u003ch3\u003eWhat Proline X Micro enclosures are\u003c\/h3\u003e\n    \u003cp\u003eProline X Micro Series enclosures are compact subwoofer cabinets built for JL Audio 10-inch and 12-inch drivers in installations where a full-size enclosure will not fit. Each cabinet is available in single and dual driver configurations, with internal volume and tuning calculated independently for each setup. The Micro designation refers to the reduced external footprint, not a reduction in construction quality or acoustic accuracy. Every enclosure ships fully prepared — prewired from the terminal cup, polyfill pre-loaded, and feet included for downfire positioning.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"ai-block\"\u003e\n    \u003ch3\u003eStack Fab construction\u003c\/h3\u003e\n    \u003cp\u003eProline X Micro enclosures are built using Stack Fab construction, a layered fabrication method that bonds MDF panels under pressure to produce rigid cabinet walls and precise internal geometry. This method eliminates the weak points associated with traditional butt joint construction and maintains cabinet integrity at the mechanical output limits of JL Audio 10-inch and 12-inch drivers. The double mounting face adds baffle rigidity directly at the driver cutout, reducing panel resonance during high-excursion operation. Stack Fab construction is used across the full Proline X lineup regardless of enclosure size or configuration.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"ai-block\"\u003e\n    \u003ch3\u003eDriver mounting and hardware\u003c\/h3\u003e\n    \u003cp\u003eThe recessed woofer cutout on each Proline X Micro enclosure uses pre-installed threaded inserts with supplied 8\/32 machine screws for driver mounting. This eliminates the need to source separate hardware and prevents the baffle material from stripping under repeated driver removal and reinstallation. The machine screw and threaded insert system creates a consistent, repeatable clamp load across the driver gasket, maintaining an airtight seal between the JL Audio driver and the baffle. All mounting hardware is included in the box.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"ai-block\"\u003e\n    \u003ch3\u003eAdvanced Terminal Cup\u003c\/h3\u003e\n    \u003cp\u003eEach Proline X Micro enclosure uses an in-house Advanced Terminal Cup built from ABS and carbon fiber with stainless steel hardware. The terminal cup ships prewired, so the internal connection between the terminal and the driver is completed at the factory before the enclosure reaches the installer. Stainless steel hardware resists corrosion in vehicle environments where humidity and temperature cycles are constant. The ABS and carbon fiber construction keeps the terminal cup rigid under repeated use without cracking or deforming.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"ai-block\"\u003e\n    \u003ch3\u003ePolyfill, prewiring, and downfire feet\u003c\/h3\u003e\n    \u003cp\u003eEvery Proline X Micro enclosure ships with polyfill pre-loaded, internal prewiring from the terminal cup completed, and stainless steel feet attached for downfire use. Polyfill increases the effective acoustic volume of a sealed enclosure without increasing its physical size, which extends low-frequency output in a cabinet where internal volume is constrained by the reduced footprint. The included feet elevate the enclosure off the vehicle floor, maintaining clearance for cone movement and port output in downfire configurations.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"ai-block\"\u003e\n    \u003ch3\u003eHow Micro fits in the Proline X lineup\u003c\/h3\u003e\n    \u003cp\u003eProline X Micro enclosures share the same Stack Fab construction, Advanced Terminal Cup, threaded insert mounting system, and hardware spec as the full-size Proline X range. The Micro Series is the correct choice when install space is the primary constraint. When clearance is not a limitation, full-size Proline X enclosures provide greater internal volume supporting lower tuning frequencies and additional excursion headroom. Both series are available for JL Audio 10-inch and 12-inch drivers in single and dual configurations.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","products":[{"product_id":"proline-x-micro-series-enclosure-fits-jl-10tw3","title":"Proline X Micro Series 10\" Sealed Enclosure - Fits JL 10TW3","description":"\u003c!-- ============================================================\n     PROLINE X MICRO SERIES — JL AUDIO 10TW3\n     PRODUCT DESCRIPTION HTML\n     Color system: Green (#16a34a primary)\n     Enclosure-only SKU\n     ============================================================ --\u003e\n\n\u003cstyle\u003e\n  .ms-wrap * { box-sizing: border-box; }\n  .ms-wrap { font-family: inherit; color: #1e293b; line-height: 1.7; max-width: 1200px; margin: 0 auto; }\n\n  \/* ── Hero ── *\/\n  .ms-hero {\n    background: linear-gradient(135deg, #0f172a 0%, #14532d 100%);\n    border-radius: 8px;\n    padding: 40px 36px;\n    margin-bottom: 32px;\n    position: relative;\n    overflow: hidden;\n  }\n  .ms-hero::before {\n    content: '';\n    position: absolute;\n    top: -40px; 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}\n\n  \/* ── Why-cards grid ── *\/\n  .ms-card-grid {\n    display: grid;\n    grid-template-columns: repeat(2, 1fr);\n    gap: 18px;\n    margin: 24px 0;\n  }\n  @media (max-width: 600px) { .ms-card-grid { grid-template-columns: 1fr; } }\n  .ms-card {\n    background: #ffffff;\n    border: 1px solid #e2e8f0;\n    border-top: 3px solid #16a34a;\n    border-radius: 6px;\n    padding: 22px;\n  }\n  .ms-card-label {\n    display: inline-block;\n    background: #16a34a;\n    color: #ffffff;\n    font-size: 0.68em;\n    font-weight: 700;\n    letter-spacing: 0.1em;\n    text-transform: uppercase;\n    padding: 3px 10px;\n    border-radius: 3px;\n    margin-bottom: 10px;\n  }\n  .ms-card h4 {\n    color: #14532d;\n    font-size: 1em;\n    font-weight: 700;\n    margin: 0 0 10px 0;\n  }\n  .ms-card-divider {\n    height: 2px;\n    background: #16a34a;\n    width: 32px;\n    margin-bottom: 12px;\n    border-radius: 2px;\n  }\n  .ms-card p {\n    font-size: 0.93em;\n    color: #475569;\n    margin: 0;\n    line-height: 1.65;\n  }\n  .ms-card p strong { color: #14532d; }\n\n  \/* ── Warranty bar ── *\/\n  .ms-warranty {\n    background: #0f172a;\n    border-left: 5px solid #16a34a;\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  .ms-warranty-badge {\n    background: #16a34a;\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  .ms-warranty p {\n    color: #cbd5e1;\n    font-size: 0.93em;\n    margin: 0;\n    line-height: 1.6;\n  }\n  .ms-warranty strong { color: #ffffff; }\n\n  \/* ── Fitment list ── *\/\n  .ms-fitment {\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) { .ms-fitment { grid-template-columns: 1fr; } }\n  .ms-fitment li {\n    font-size: 0.93em;\n    color: #334155;\n    padding: 8px 12px;\n    background: #f0fdf4;\n    border-left: 3px solid #16a34a;\n    border-radius: 0 4px 4px 0;\n  }\n\n  \/* ── Divider ── *\/\n  .ms-divider {\n    border: none;\n    border-top: 1px solid #e2e8f0;\n    margin: 32px 0;\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"ms-wrap\"\u003e\n\n  \u003c!-- HERO --\u003e\n  \u003cdiv class=\"ms-hero\"\u003e\n    \u003cspan class=\"ms-hero-badge\"\u003eMicro Series | Enclosure Only\u003c\/span\u003e\n    \u003ch2\u003eBuilt Around the JL Audio 10TW3.\u003cbr\u003eNot Adapted to It.\u003c\/h2\u003e\n    \u003cp\u003eThe JL Audio 10TW3-D4 has one of the most precisely engineered shallow-mount motor structures in the industry. That precision only pays off inside an enclosure engineered to match it. The Proline X Micro Series enclosure for the 10TW3 delivers an exact 0.50 cubic foot sealed environment — the volume JL Audio specifies for optimal acoustic damping — in a 5.25\" total depth that fits where conventional builds cannot.\u003c\/p\u003e\n    \u003cdiv class=\"ms-hero-stats\"\u003e\n      \u003cdiv class=\"ms-stat\"\u003e\n        \u003cspan class=\"ms-stat-num\"\u003e0.50\u003c\/span\u003e\n        \u003cspan class=\"ms-stat-label\"\u003eCu Ft Net Volume\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ms-stat\"\u003e\n        \u003cspan class=\"ms-stat-num\"\u003e5.25\"\u003c\/span\u003e\n        \u003cspan class=\"ms-stat-label\"\u003eTotal Depth\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ms-stat\"\u003e\n        \u003cspan class=\"ms-stat-num\"\u003e3.25\"\u003c\/span\u003e\n        \u003cspan class=\"ms-stat-label\"\u003eMax Mount Depth\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ms-stat\"\u003e\n        \u003cspan class=\"ms-stat-num\"\u003eCNC\u003c\/span\u003e\n        \u003cspan class=\"ms-stat-label\"\u003eCut in Tennessee\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ENCLOSURE ONLY NOTICE --\u003e\n  \u003cdiv class=\"ms-alert\"\u003e\n    \u003cstrong\u003eEnclosure only.\u003c\/strong\u003e The JL Audio 10TW3-D4 subwoofer is not included. This enclosure is designed for customers who already own or are separately purchasing the 10TW3-D4 or 10TW3-D8.\n  \u003c\/div\u003e\n\n  \u003c!-- SECTION 1: Why This Enclosure --\u003e\n  \u003cdiv class=\"ms-section\"\u003e\n    \u003ch3\u003eWhy the Enclosure Matters as Much as the Driver\u003c\/h3\u003e\n    \u003cp\u003eThe JL Audio 10TW3-D4 has a free-air resonance of 32.3 Hz, a Qts of 0.62, and a Vas of 19.82 liters. Those numbers tell you exactly what this driver needs from its enclosure: a sealed box in the 0.50 cubic foot range produces a system Qtc near 0.88 — a slightly elevated damping curve that gives the 10TW3 the extension and transient control it was designed to deliver in compact sealed installs.\u003c\/p\u003e\n    \u003cp\u003eGeneric \"universal\" thin-box enclosures are built to an approximate size and sold across multiple driver models. Internal volume tolerances are loose, joints are glued without mechanical locking, and the panel mass is rarely sufficient to stay acoustically inert at high excursion levels. This enclosure is built to a defined spec for one driver. Internal volume is held to within 0.01 cubic foot. Every panel joint is CNC-cut for a mechanical dado fit before adhesive is applied. The result is a box that behaves the way the modeling says it should — consistently, from unit to unit.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- SECTION 2: Stack Fab Construction --\u003e\n  \u003cdiv class=\"ms-section\"\u003e\n    \u003ch3\u003eStack Fab Construction — Why Depth Is Not the Enemy\u003c\/h3\u003e\n    \u003cp\u003eThin enclosures have a structural problem that standard-depth boxes don't: less panel depth means less rigidity, which means more panel resonance. The Proline X Micro Series addresses this directly through stack-fab layering — CNC-cut MDF panels are layered and bonded in overlapping orientations so that no glue joint runs the full depth of any critical wall. The result is a high-mass, mechanically locked enclosure that resists flex at the panel level, not just at the corners.\u003c\/p\u003e\n    \u003cp\u003eEvery interior dimension is machined to maintain 0.50 cubic feet of net internal volume after accounting for driver displacement, terminal hardware, and polyfill. Polyfill is pre-installed from the factory — it increases the effective acoustic volume by slowing the speed of sound inside the enclosure, which extends low-frequency performance without adding external size.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- WHY CARDS --\u003e\n  \u003cdiv class=\"ms-card-grid\"\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eVolume\u003c\/span\u003e\n      \u003ch4\u003eSpec-Matched to JL Audio's Published Data\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eJL Audio publishes an optimum sealed volume of \u003cstrong\u003e0.50 cubic feet\u003c\/strong\u003e for the 10TW3. This enclosure delivers exactly that — not approximately, not \"up to.\" Internal volume is machined to tolerance so the driver's Qtc lands where the T\/S parameters predict it.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eDepth\u003c\/span\u003e\n      \u003ch4\u003e5.25\" Total — Driver Clears with Margin\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe 10TW3 requires \u003cstrong\u003e3.25\" of mounting depth\u003c\/strong\u003e. The Micro Series provides 4.5\" of usable internal depth — enough for full driver clearance including the rear magnet structure, with no contact risk at full excursion.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eStructure\u003c\/span\u003e\n      \u003ch4\u003eDado Joinery — No Joint Relies on Glue Alone\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eEvery panel-to-panel connection uses CNC-cut interlocking dado slots. The mechanical fit holds the joint in alignment under load. Adhesive seals the joint permanently. Neither alone is sufficient — both together create a connection that will not loosen, shift, or leak under sustained high-excursion use.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eWiring\u003c\/span\u003e\n      \u003ch4\u003eGold-Plated Terminal Cup — Pre-Wired from the Factory\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe enclosure ships with a \u003cstrong\u003egold-plated spring-loaded terminal cup\u003c\/strong\u003e already installed and pre-wired internally with \u003cstrong\u003e12-gauge oxygen-free copper\u003c\/strong\u003e run directly to the driver mounting location. Connect your amplifier run to the terminal cup, mount the driver to the threaded inserts, and you are done. No internal wiring work required.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eAcoustic\u003c\/span\u003e\n      \u003ch4\u003eFactory-Installed Polyfill\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003ePolyfill is packed and installed at the factory. It acoustically increases the effective volume of the enclosure, extending the 10TW3's low-frequency output without changing the external footprint. This is not a cosmetic addition — it is an acoustic tuning step built into the manufacturing process.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eFitment\u003c\/span\u003e\n      \u003ch4\u003e9.625\" Cutout — Matches JL Audio Tab-Ear Spec\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe 10TW3 uses a tab-ear mounting system with a \u003cstrong\u003e9.625\" cutout diameter\u003c\/strong\u003e — this enclosure is machined to that exact spec. The mounting hole is not a generic 10\" cutout trimmed down. The baffle is cut for this driver specifically.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eMounting\u003c\/span\u003e\n      \u003ch4\u003eThreaded Inserts — Machine Screw Mounting, Not Wood Screws\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe back side of the baffle is fitted with \u003cstrong\u003e8\/32 threaded inserts\u003c\/strong\u003e. The 10TW3 mounts with machine screws threading into steel inserts — not wood screws biting into MDF. Machine screw mounting does not strip out under repeated removal, maintains consistent clamping force across all mounting points, and holds the driver flush against the baffle gasket without over-torquing any single corner.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- HIGHLIGHT: Installer Note --\u003e\n  \u003cdiv class=\"ms-highlight\"\u003e\n    \u003ch3\u003eReady to Mount. Ready to Wire.\u003c\/h3\u003e\n    \u003cp\u003eThe Micro Series enclosure ships fully prepped for installation. The \u003cstrong\u003egold-plated spring-loaded terminal cup\u003c\/strong\u003e is installed and pre-wired to the driver location with 12-gauge OFC — connect your amplifier run and you are done on the wiring side. The baffle is fitted with \u003cstrong\u003e8\/32 threaded inserts\u003c\/strong\u003e on the back face — the 10TW3 mounts with machine screws into steel inserts, not wood screws into MDF. No risk of stripped mounting holes on a future driver swap.\u003c\/p\u003e\n    \u003ch3 style=\"margin-top:18px;\"\u003eA Note on Impedance Options\u003c\/h3\u003e\n    \u003cp\u003eThe JL Audio 10TW3 is available in two impedance configurations: the \u003cstrong\u003e10TW3-D4\u003c\/strong\u003e (dual 4-ohm voice coils) and the \u003cstrong\u003e10TW3-D8\u003c\/strong\u003e (dual 8-ohm voice coils). This enclosure fits both — cutout diameter, mounting depth, and internal volume are identical across D4 and D8 builds.\u003c\/p\u003e\n    \u003cp\u003eWith a D4: wire parallel for a 2-ohm load or series for an 8-ohm load. With a D8: wire parallel for a 4-ohm load or series for a 16-ohm load. Most amplifier pairings use the D4 wired to 2 ohms. Confirm your amplifier's stable impedance before selecting the driver variant.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FITMENT SECTION --\u003e\n  \u003cdiv class=\"ms-section\"\u003e\n    \u003ch3\u003eWhere It Fits\u003c\/h3\u003e\n    \u003cp\u003eAt 21.5\" × 14.5\" × 5.25\", this enclosure fits in spaces that rule out virtually every conventional sealed build. Common install locations:\u003c\/p\u003e\n    \u003cul class=\"ms-fitment\"\u003e\n      \u003cli\u003eUnder-seat — extended cab and crew cab trucks\u003c\/li\u003e\n      \u003cli\u003eTrunk corners — compact and mid-size sedans\u003c\/li\u003e\n      \u003cli\u003eSide cargo panels — SUVs and crossovers\u003c\/li\u003e\n      \u003cli\u003eBehind-seat — full-size truck cabs\u003c\/li\u003e\n      \u003cli\u003eHatch floor — sports cars and hatchbacks\u003c\/li\u003e\n      \u003cli\u003eUnder-bed storage — utility and work vehicles\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- WARRANTY --\u003e\n  \u003cdiv class=\"ms-warranty\"\u003e\n    \u003cdiv class=\"ms-warranty-badge\"\u003e2-Year Warranty\u003c\/div\u003e\n    \u003cp\u003e\u003cstrong\u003eAll Proline X Micro Series enclosures are covered by a two-year manufacturer's warranty\u003c\/strong\u003e against defects in materials and workmanship. Enclosures are built in our Tennessee facility and inspected before shipment. Contact Audio Intensity directly for warranty support.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003chr class=\"ms-divider\"\u003e\n\n  \u003cdiv class=\"ms-section\"\u003e\n    \u003ch3\u003eMade in Tennessee\u003c\/h3\u003e\n    \u003cp\u003eEvery Proline X Micro Series enclosure is CNC-cut and hand-assembled in Tullahoma, Tennessee. Panels are cut on ShopSabre CNC routers to maintain dimensional tolerances that manual fabrication cannot achieve consistently. Internal volume, dado joint depth, cutout diameter, and terminal cup placement are all held to spec on every unit — not just on the sample used to generate the product listing. \u003cspan class=\"ms-langboard\"\u003eLangboard Elite MDF\u003c\/span\u003e is used across the full Micro Series build — a named, mill-documented board with published density specifications, not a generic \"premium MDF\" claim.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":43075494641753,"sku":"M10-S JL","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/jl-audio-10tw3-d4-in-proline-x-micro-series-enclosureenclosed-subwooferproline-x-745238.jpg?v=1774209158"},{"product_id":"proline-x-micro-series-12-sealed-enclosure-fits-jl-12tw3","title":"Proline X Micro Series 12\" Sealed Enclosure - Fits JL 12TW3","description":"\u003c!-- ============================================================\n     PROLINE X MICRO SERIES — JL AUDIO 12TW3\n     SEALED 12\" ENCLOSURE ONLY\n     Color system: Green (#16a34a primary)\n     ============================================================ --\u003e\n\n\u003cstyle\u003e\n  .ms-wrap * { box-sizing: border-box; }\n  .ms-wrap { font-family: inherit; color: #1e293b; line-height: 1.7; max-width: 1200px; margin: 0 auto; }\n\n  .ms-hero {\n    background: linear-gradient(135deg, #0f172a 0%, #14532d 100%);\n    border-radius: 8px;\n    padding: 40px 36px;\n    margin-bottom: 32px;\n    position: relative;\n    overflow: hidden;\n  }\n  .ms-hero::before {\n    content: '';\n    position: absolute;\n    top: -40px; right: -40px;\n    width: 220px; height: 220px;\n    background: rgba(22,163,74,0.12);\n    border-radius: 50%;\n  }\n  .ms-hero-badge {\n    display: inline-block;\n    background: transparent;\n    border: 2px solid #16a34a;\n    color: #86efac;\n    font-size: 0.75em;\n    font-weight: 700;\n    letter-spacing: 0.12em;\n    text-transform: uppercase;\n    padding: 4px 14px;\n    border-radius: 20px;\n    margin-bottom: 16px;\n  }\n  .ms-hero h2 { color: #ffffff; font-size: 1.65em; font-weight: 800; margin: 0 0 14px 0; line-height: 1.25; }\n  .ms-hero p { color: #cbd5e1; font-size: 1em; margin: 0 0 24px 0; max-width: 640px; line-height: 1.7; }\n  .ms-hero-stats { display: flex; gap: 28px; flex-wrap: wrap; }\n  .ms-stat { text-align: center; }\n  .ms-stat-num { display: block; color: #86efac; font-size: 1.5em; font-weight: 800; line-height: 1; }\n  .ms-stat-label { display: block; color: #94a3b8; font-size: 0.72em; letter-spacing: 0.08em; text-transform: uppercase; margin-top: 4px; }\n\n  .ms-section {\n    background: #ffffff;\n    border: 1px solid #e2e8f0;\n    border-top: 4px solid #16a34a;\n    border-radius: 6px;\n    padding: 28px 32px;\n    margin-bottom: 24px;\n  }\n  .ms-section:nth-child(odd) { background: #f8fafc; }\n  .ms-section h3 { color: #14532d; font-size: 1.15em; font-weight: 700; margin: 0 0 14px 0; }\n  .ms-section p { color: #334155; font-size: 0.97em; margin: 0 0 12px 0; }\n  .ms-section p:last-child { margin-bottom: 0; }\n\n  .ms-highlight {\n    background: #f0fdf4;\n    border-left: 5px solid #16a34a;\n    padding: 22px 28px;\n    margin: 28px 0;\n    border-radius: 0 6px 6px 0;\n  }\n  .ms-highlight h3 { color: #14532d; margin: 0 0 10px 0; font-size: 1.1em; font-weight: 700; }\n  .ms-highlight h3 + h3 { margin-top: 18px; }\n  .ms-highlight p { margin-bottom: 10px; color: #1e293b; font-size: 0.97em; }\n  .ms-highlight p:last-child { margin-bottom: 0; }\n\n  .ms-alert {\n    background: #dcfce7;\n    border: 1px solid #16a34a;\n    border-radius: 6px;\n    padding: 14px 18px;\n    margin: 20px 0;\n    font-size: 0.93em;\n    color: #166534;\n  }\n  .ms-alert strong { color: #14532d; }\n\n  .ms-card-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin: 24px 0; }\n  @media (max-width: 600px) { .ms-card-grid { grid-template-columns: 1fr; } }\n  .ms-card {\n    background: #ffffff;\n    border: 1px solid #e2e8f0;\n    border-top: 3px solid #16a34a;\n    border-radius: 6px;\n    padding: 22px;\n  }\n  .ms-card-label {\n    display: inline-block;\n    background: #16a34a;\n    color: #ffffff;\n    font-size: 0.68em;\n    font-weight: 700;\n    letter-spacing: 0.1em;\n    text-transform: uppercase;\n    padding: 3px 10px;\n    border-radius: 3px;\n    margin-bottom: 10px;\n  }\n  .ms-card h4 { color: #14532d; font-size: 1em; font-weight: 700; margin: 0 0 10px 0; }\n  .ms-card-divider { height: 2px; background: #16a34a; width: 32px; margin-bottom: 12px; border-radius: 2px; }\n  .ms-card p { font-size: 0.93em; color: #475569; margin: 0; line-height: 1.65; }\n  .ms-card p strong { color: #14532d; }\n\n  .ms-warranty {\n    background: #0f172a;\n    border-left: 5px solid #16a34a;\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  .ms-warranty-badge { background: #16a34a; color: #ffffff; font-size: 1em; font-weight: 800; padding: 10px 16px; border-radius: 4px; white-space: nowrap; }\n  .ms-warranty p { color: #cbd5e1; font-size: 0.93em; margin: 0; line-height: 1.6; }\n  .ms-warranty strong { color: #ffffff; }\n\n  .ms-fitment { list-style: none; margin: 14px 0 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }\n  @media (max-width: 560px) { .ms-fitment { grid-template-columns: 1fr; } }\n  .ms-fitment li { font-size: 0.93em; color: #334155; padding: 8px 12px; background: #f0fdf4; border-left: 3px solid #16a34a; border-radius: 0 4px 4px 0; }\n\n  .ms-divider { border: none; border-top: 1px solid #e2e8f0; margin: 32px 0; }\n  .ms-langboard { font-weight: 700; color: #14532d; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"ms-wrap\"\u003e\n\n  \u003c!-- HERO --\u003e\n  \u003cdiv class=\"ms-hero\"\u003e\n    \u003cspan class=\"ms-hero-badge\"\u003eMicro Series | JL 12TW3 | Enclosure Only\u003c\/span\u003e\n    \u003ch2\u003eBuilt Around the JL Audio 12TW3.\u003cbr\u003e0.80 cu ft. Exactly.\u003c\/h2\u003e\n    \u003cp\u003eJL Audio publishes 0.80 cubic feet as the optimum sealed volume for the 12TW3. The Proline X Micro Series enclosure for the 12TW3 delivers exactly that — net, after displacement — in a double-layer stack-fab build that is 6.75 inches deep. Tab-ear cutout machined to JL Audio's exact geometry. 8\/32 threaded inserts for machine screw mounting. Front-firing or downfiring with feet included.\u003c\/p\u003e\n    \u003cdiv class=\"ms-hero-stats\"\u003e\n      \u003cdiv class=\"ms-stat\"\u003e\n        \u003cspan class=\"ms-stat-num\"\u003e0.80\u003c\/span\u003e\n        \u003cspan class=\"ms-stat-label\"\u003eCu Ft Net — JL Optimum\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ms-stat\"\u003e\n        \u003cspan class=\"ms-stat-num\"\u003e6.75\"\u003c\/span\u003e\n        \u003cspan class=\"ms-stat-label\"\u003eTotal Depth\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ms-stat\"\u003e\n        \u003cspan class=\"ms-stat-num\"\u003e1.5\"\u003c\/span\u003e\n        \u003cspan class=\"ms-stat-label\"\u003eDouble-Layer Baffle\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"ms-stat\"\u003e\n        \u003cspan class=\"ms-stat-num\"\u003e3.5\"\u003c\/span\u003e\n        \u003cspan class=\"ms-stat-label\"\u003eMax Mount Depth\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ENCLOSURE ONLY NOTICE --\u003e\n  \u003cdiv class=\"ms-alert\"\u003e\n    \u003cstrong\u003eEnclosure only.\u003c\/strong\u003e The JL Audio 12TW3 subwoofer is not included. This enclosure fits both the 12TW3-D4 and 12TW3-D8 — the tab-ear cutout geometry and mounting hardware are identical across both variants.\n  \u003c\/div\u003e\n\n  \u003c!-- SECTION 1: Volume --\u003e\n  \u003cdiv class=\"ms-section\"\u003e\n    \u003ch3\u003e0.80 Cubic Feet — JL Audio's Published Optimum, Delivered Net\u003c\/h3\u003e\n    \u003cp\u003eThe JL Audio 12TW3 has a Fs of 26.5 Hz, a Qts of 0.53, and a Vas of 48.7 liters. JL Audio's published optimum sealed volume for this driver is 0.80 cubic feet. At that volume the system Qtc lands at the target JL Audio designed for in compact sealed applications — producing controlled extension into the low 30s with the tight transient response the TW3 platform is built around.\u003c\/p\u003e\n    \u003cp\u003eGeneric 12\" shallow-mount enclosures are built to approximate volumes and sold as universal fits. This enclosure is built to one spec, for one driver. The 0.80 cubic foot figure is net internal volume — calculated after driver displacement, double-layer baffle thickness, and polyfill are subtracted. Not approximated from external box dimensions before hardware is accounted for.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- SECTION 2: Construction --\u003e\n  \u003cdiv class=\"ms-section\"\u003e\n    \u003ch3\u003eStack-Fab Construction with a 1.5\" Double-Layer Baffle\u003c\/h3\u003e\n    \u003cp\u003eThe front baffle is a double-layer stack-fab build — two CNC-cut Langboard Elite MDF panels bonded to 1.5 inches total thickness. The baffle carries the driver's mechanical mounting load and sustains the full acoustic pressure differential between the sealed interior and exterior on every bass transient. At 400 watts RMS on a 12\" cone, a single 3\/4\" panel resonates at frequencies within the driver's operating range. Two bonded layers eliminate that coloration at the structural level.\u003c\/p\u003e\n    \u003cp\u003eThe rest of the enclosure uses CNC-cut interlocking dado joints at every panel intersection — mechanical interlock before adhesive, adhesive seal after. Neither alone is the joint. The 6.75\" total depth gives each side panel more inherent geometric rigidity than the ultra-shallow Wavtech builds in the same series, which means the dado joinery here is reinforcing an already more rigid structure rather than compensating for shallow panel depth.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- WHY CARDS --\u003e\n  \u003cdiv class=\"ms-card-grid\"\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eVolume\u003c\/span\u003e\n      \u003ch4\u003e0.80 cu ft Net — JL Audio's Published Optimum\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eJL Audio specifies \u003cstrong\u003e0.80 cubic feet\u003c\/strong\u003e as the optimum sealed volume for the 12TW3. This enclosure delivers that number net — after driver displacement, double-layer baffle thickness, and polyfill are subtracted. Not approximated from external dimensions.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eBaffle\u003c\/span\u003e\n      \u003ch4\u003e1.5\" Double-Layer — Baffle Resonance Eliminated\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eTwo bonded layers of \u003cstrong\u003eLangboard Elite 3\/4\" MDF\u003c\/strong\u003e produce a 1.5-inch baffle that does not flex or resonate at 400 watts RMS on a 12\" driver. Panel resonance at the baffle adds coloration to bass output — double-layer construction eliminates it at the source.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eMounting\u003c\/span\u003e\n      \u003ch4\u003e8\/32 Threaded Inserts — Correct for Tab-Ear Drivers\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe 12TW3 uses injection-molded plastic mounting ears. Tapered wood screws apply outward pressure to those ears and will crack them under sustained vibration. \u003cstrong\u003e8\/32 threaded inserts\u003c\/strong\u003e with stainless machine screws eliminate this failure mode entirely — the driver mounts to steel, not MDF, with even clamping force across all four ears.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eWiring\u003c\/span\u003e\n      \u003ch4\u003eProline X Terminal Cup — Pre-Wired with 12g OFC\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe \u003cstrong\u003eProline X terminal cup\u003c\/strong\u003e is installed and pre-wired with \u003cstrong\u003e12-gauge OFC\u003c\/strong\u003e run internally to the driver location. Connect your amplifier run to the terminal and mount the driver — no internal wiring work required.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eCutout\u003c\/span\u003e\n      \u003ch4\u003e11-5\/8\" Tab-Ear Geometry — Machined for the 12TW3\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe baffle cutout is machined to the \u003cstrong\u003e12TW3's tab-ear geometry\u003c\/strong\u003e — 11-5\/8\" (295mm) with mounting points positioned for the TW3's four-ear spacing. The driver seats flush against the baffle gasket without shimming or modification.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eConfiguration\u003c\/span\u003e\n      \u003ch4\u003eFront-Firing or Downfiring — Feet Included\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eRubber feet for \u003cstrong\u003edownfiring installation\u003c\/strong\u003e are included. Run it front-firing in a standard trunk or cargo orientation, or flip it downward to couple bass output with the vehicle floor. The 12TW3's no-pole-vent design means there are no motor ventilation concerns in either orientation.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eStructure\u003c\/span\u003e\n      \u003ch4\u003eDado Joinery — No Joint Relies on Glue Alone\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eEvery panel joint uses CNC-cut interlocking \u003cstrong\u003edado slots\u003c\/strong\u003e — the mechanical interlock holds panel alignment under load before adhesive is applied. The adhesive seals the joint permanently. Both together produce an airtight, acoustically inert enclosure that holds its integrity under sustained use.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eAcoustic\u003c\/span\u003e\n      \u003ch4\u003ePolyfill Pre-Installed at the Factory\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003ePolyfill is packed and installed at the factory before the enclosure ships. It acoustically extends effective internal volume for improved low-frequency output without adding external size. \u003cstrong\u003eFactory installation\u003c\/strong\u003e ensures consistent packing density on every unit — not left to the installer to approximate.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"ms-card\"\u003e\n      \u003cspan class=\"ms-card-label\"\u003eReinforcement\u003c\/span\u003e\n      \u003ch4\u003eDowel-Reinforced Stack Fab — Mechanical Strength Beyond the Joint\u003c\/h4\u003e\n      \u003cdiv class=\"ms-card-divider\"\u003e\u003c\/div\u003e\n      \u003cp\u003eThe stack-fab assembly is further reinforced with \u003cstrong\u003edowels throughout the construction\u003c\/strong\u003e. Dowels add mechanical alignment and shear resistance at panel joints beyond what dado joinery and adhesive alone provide — locking the panel stack against lateral movement under the sustained excursion load a sealed enclosure generates at volume. The result is a structure that holds its geometry and its acoustic seal over years of real-world use.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- HIGHLIGHT --\u003e\n  \u003cdiv class=\"ms-highlight\"\u003e\n    \u003ch3\u003eReady to Mount. Ready to Wire. Ready to Downfire.\u003c\/h3\u003e\n    \u003cp\u003eThe enclosure ships fully prepped. The \u003cstrong\u003eProline X terminal cup\u003c\/strong\u003e is installed and pre-wired with 12-gauge OFC — connect your amplifier run and that side is complete. The double-layer baffle uses \u003cstrong\u003e8\/32 threaded inserts\u003c\/strong\u003e with stainless machine screws included — both critical for the 12TW3's tab-ear mounting system. \u003cstrong\u003eRubber feet for downfiring\u003c\/strong\u003e are included. Polyfill is already packed.\u003c\/p\u003e\n    \u003ch3\u003eImpedance Options — 12TW3-D4 and 12TW3-D8\u003c\/h3\u003e\n    \u003cp\u003eThe JL Audio 12TW3 is available as the \u003cstrong\u003e12TW3-D4\u003c\/strong\u003e (dual 4-ohm voice coils) and the \u003cstrong\u003e12TW3-D8\u003c\/strong\u003e (dual 8-ohm voice coils). Both variants are physically identical and fit this enclosure. With the D4 wired in parallel you present a 2-ohm load; series presents 8 ohms. With the D8 wired in parallel you present a 4-ohm load; series presents 16 ohms. Most builds run the D4 at 2 ohms into a 2-ohm-stable monoblock in the 300–400 watt RMS range.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FITMENT --\u003e\n  \u003cdiv class=\"ms-section\"\u003e\n    \u003ch3\u003eWhere It Fits\u003c\/h3\u003e\n    \u003cp\u003eAt 26\" × 14.75\" × 6.75\", this enclosure opens install locations that a conventional 0.80 cu ft sealed 12\" box — typically 10–14\" deep — cannot reach:\u003c\/p\u003e\n    \u003cul class=\"ms-fitment\"\u003e\n      \u003cli\u003eBehind-seat — full-size crew cab and extended cab trucks\u003c\/li\u003e\n      \u003cli\u003eUnder rear bench — SUVs and full-size vans\u003c\/li\u003e\n      \u003cli\u003eTrunk floor — full-size sedans and wagons\u003c\/li\u003e\n      \u003cli\u003eCargo floor — crossovers and mid-size SUVs\u003c\/li\u003e\n      \u003cli\u003eHatch floor — sports cars and hatchbacks\u003c\/li\u003e\n      \u003cli\u003eBehind-seat downfire — truck cabs where floor coupling improves response\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- WARRANTY --\u003e\n  \u003cdiv class=\"ms-warranty\"\u003e\n    \u003cdiv class=\"ms-warranty-badge\"\u003e2-Year Warranty\u003c\/div\u003e\n    \u003cp\u003e\u003cstrong\u003eAll Proline X Micro Series enclosures carry a two-year manufacturer's warranty\u003c\/strong\u003e against defects in materials and workmanship. Built and inspected in our Tullahoma, Tennessee facility before shipment. Contact Audio Intensity directly for warranty support.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003chr class=\"ms-divider\"\u003e\n\n  \u003cdiv class=\"ms-section\"\u003e\n    \u003ch3\u003eMade in Tennessee\u003c\/h3\u003e\n    \u003cp\u003eEvery Proline X Micro Series enclosure is CNC-cut and hand-assembled in Tullahoma, Tennessee on ShopSabre CNC routers. Internal volume, dado joint depth, tab-ear cutout geometry, baffle layer count, and terminal placement are all held to spec on every unit. \u003cspan class=\"ms-langboard\"\u003eLangboard Elite MDF\u003c\/span\u003e throughout — a named, mill-documented board with published density, internal bond, and screw-holding specifications.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":43172437688409,"sku":"M12-S JL","price":269.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/jl-audio-10tw3-d4-in-proline-x-micro-series-enclosureenclosed-subwooferproline-x-745238.jpg?v=1774209158"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/collections\/proline-x-micro-series-subwoofer-boxes-jl-audio-2080998.jpg?v=1775820379","url":"https:\/\/audiointensity.com\/collections\/proline-x-micro-series-subwoofer-boxes-jl-audio.oembed","provider":"Audio Intensity","version":"1.0","type":"link"}