{"product_id":"proline-x-p8t-s-triple-8-sealed-subwoofer-enclosure-v3","title":"Proline X P8T-S | Triple 8\" Sealed Subwoofer Enclosure | V3","description":"\u003cstyle\u003e\n  .px-desc {\n    font-family: 'Helvetica Neue', Arial, sans-serif;\n    line-height: 1.8;\n    color: #1e293b;\n    max-width: 1200px;\n    margin: 0 auto;\n    background: #ffffff;\n  }\n\n  .px-hero {\n    background: linear-gradient(135deg, #0f172a 0%, #0e7490 100%);\n    padding: 60px 40px;\n    text-align: center;\n    color: white;\n  }\n\n  .px-hero .px-title {\n    font-size: 2.6em;\n    font-weight: 800;\n    text-transform: uppercase;\n    letter-spacing: 2px;\n    margin: 0 0 10px 0;\n    color: white;\n  }\n\n  .px-hero .px-subtitle {\n    font-size: 1.2em;\n    font-weight: 300;\n    opacity: 0.9;\n    margin: 0 0 30px 0;\n  }\n\n  .px-badges {\n    display: flex;\n    justify-content: center;\n    flex-wrap: wrap;\n    gap: 12px;\n    margin-top: 20px;\n  }\n\n  .px-badge {\n    background: rgba(6, 182, 212, 0.2);\n    border: 1px solid #06b6d4;\n    color: #67e8f9;\n    padding: 8px 20px;\n    border-radius: 20px;\n    font-size: 0.9em;\n    font-weight: 600;\n    letter-spacing: 0.5px;\n  }\n\n  .px-section {\n    padding: 50px 40px;\n    border-bottom: 1px solid #e2e8f0;\n    background: #ffffff;\n  }\n\n  .px-section:nth-child(even) {\n    background: #f0f9ff;\n  }\n\n  .px-section h2 {\n    color: #0e7490;\n    font-size: 2em;\n    font-weight: 700;\n    margin: 0 0 20px 0;\n    padding-bottom: 12px;\n    border-bottom: 3px solid #06b6d4;\n  }\n\n  .px-section h3 {\n    color: #0f172a;\n    font-size: 1.4em;\n    font-weight: 600;\n    margin: 30px 0 15px 0;\n  }\n\n  .px-section p {\n    font-size: 1.05em;\n    color: #334155;\n    margin-bottom: 18px;\n  }\n\n  .px-section ul {\n    margin: 15px 0;\n    padding-left: 25px;\n  }\n\n  .px-section li {\n    font-size: 1.05em;\n    color: #334155;\n    margin-bottom: 10px;\n    line-height: 1.7;\n  }\n\n  .px-grid {\n    display: grid;\n    grid-template-columns: repeat(2, 1fr);\n    gap: 24px;\n    margin: 30px 0;\n  }\n\n  .px-card {\n    background: #ffffff;\n    border: 1px solid #e2e8f0;\n    border-top: 4px solid #06b6d4;\n    border-radius: 6px;\n    padding: 24px;\n  }\n\n  .px-card h4 {\n    color: #0e7490;\n    font-size: 1.15em;\n    font-weight: 700;\n    margin: 0 0 12px 0;\n  }\n\n  .px-card p {\n    font-size: 1em;\n    color: #475569;\n    margin: 0;\n    line-height: 1.7;\n  }\n\n  .px-highlight {\n    background: #f0f9ff;\n    border-left: 5px solid #06b6d4;\n    padding: 24px 28px;\n    margin: 28px 0;\n    border-radius: 0 6px 6px 0;\n  }\n\n  .px-highlight h3 {\n    color: #0e7490;\n    margin: 0 0 12px 0;\n    font-size: 1.2em;\n  }\n\n  .px-highlight p {\n    margin-bottom: 10px;\n    color: #1e293b;\n  }\n\n  .px-cta {\n    background: linear-gradient(135deg, #0f172a 0%, #0e7490 100%);\n    padding: 60px 40px;\n    text-align: center;\n    color: white;\n  }\n\n  .px-cta h2 {\n    font-size: 2.2em;\n    font-weight: 700;\n    margin: 0 0 20px 0;\n    color: white;\n    border: none;\n    padding: 0;\n  }\n\n  .px-cta p {\n    font-size: 1.15em;\n    opacity: 0.92;\n    max-width: 800px;\n    margin: 0 auto 20px auto;\n    color: white;\n  }\n\n  .px-driver-link {\n    display: inline-block;\n    background: #f0f9ff;\n    border: 2px solid #06b6d4;\n    border-radius: 6px;\n    padding: 16px 24px;\n    margin: 10px 10px 10px 0;\n    text-decoration: none;\n    color: #0e7490;\n    font-weight: 700;\n    font-size: 1em;\n    transition: all 0.2s ease;\n  }\n\n  .px-driver-link:hover {\n    background: #06b6d4;\n    color: white;\n  }\n\n  @media (max-width: 768px) {\n    .px-hero { padding: 40px 20px; }\n    .px-hero .px-title { font-size: 1.8em; }\n    .px-section { padding: 30px 20px; }\n    .px-section h2 { font-size: 1.6em; }\n    .px-grid { grid-template-columns: 1fr; }\n    .px-cta { padding: 40px 20px; }\n    .px-cta h2 { font-size: 1.6em; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"px-desc\"\u003e\n\n  \u003c!-- Hero --\u003e\n  \u003cdiv class=\"px-hero\"\u003e\n    \u003cp class=\"px-title\"\u003eProline X P8T-S\u003c\/p\u003e\n    \u003cp class=\"px-subtitle\"\u003eTriple 8\" Sealed Subwoofer Enclosure | V3\u003c\/p\u003e\n    \u003cdiv class=\"px-badges\"\u003e\n      \u003cspan class=\"px-badge\"\u003e1.35 ft³ Net\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003eSealed Alignment\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003eTriple Driver Configuration\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003e10.5\" Max Depth\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003eLangboard Elite MDF\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Introduction --\u003e\n  \u003cdiv class=\"px-section\"\u003e\n    \u003ch2\u003eThree Drivers. Sealed. Built for Installs Where Depth Is the Limiting Factor.\u003c\/h2\u003e\n    \u003cp\u003eThe \u003cstrong\u003eProline X P8T-S\u003c\/strong\u003e is a triple 8\" sealed enclosure built for installs that need the cone area of a larger driver without the depth requirement that comes with it. At \u003cstrong\u003e1.35 ft³ net\u003c\/strong\u003e — 0.45 ft³ per driver — and sealed alignment, this enclosure delivers controlled, accurate bass across a wide soundstage. Three 8\" drivers in sealed alignment produce combined cone area that sits between a single 12\" and a single 15\" while keeping individual mounting depth at \u003cstrong\u003e10.5\"\u003c\/strong\u003e — a configuration that opens up install locations that neither of those larger drivers can access.\u003c\/p\u003e\n    \u003cp\u003eAt \u003cstrong\u003e29\" wide, 10\" tall, and 12\" deep\u003c\/strong\u003e, the P8T-S fits across most trunk floors, behind most rear seats in full-size sedans and trucks, and against rear walls in dedicated build vehicles where a 15\" would require too much depth. The 10\" height and 12\" depth profile makes this one of the most versatile multi-driver sealed enclosures in the Performance Series lineup.\u003c\/p\u003e\n    \u003cp\u003eA single terminal cup handles wiring for all three drivers internally — all three must be run at the same impedance. Every panel is CNC-cut from \u003cstrong\u003eLangboard Elite MDF\u003c\/strong\u003e and assembled by hand in our Tennessee facility. Finish options are Dark Gray Trunkliner or Plush Black. Shipping is included.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Why Triple Sealed --\u003e\n  \u003cdiv class=\"px-section\"\u003e\n    \u003ch2\u003eWhy Three 8\" Drivers in Sealed Alignment\u003c\/h2\u003e\n    \u003cp\u003eThe triple 8\" sealed configuration is an underutilized format in car audio. Most builders default to a single large driver when they want combined output — a 12\" or 15\" in a ported box. The P8T-S offers a different approach: three smaller drivers in sealed alignment that collectively produce the cone area of a large driver while individually maintaining the low moving mass and transient speed that defines the 8\" format.\u003c\/p\u003e\n    \u003cp\u003eEach driver bay provides \u003cstrong\u003e0.45 ft³\u003c\/strong\u003e of net internal volume — well within the recommended sealed range for most 8\" drivers. All three drivers are working the same correctly-sized air load. The combined output across three drivers is significantly higher than a single 8\" sealed, and the sealed alignment preserves the accuracy that makes the 8\" format valuable for critical listening and SQ competition builds.\u003c\/p\u003e\n    \u003cdiv class=\"px-grid\"\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eCombined Cone Area\u003c\/h4\u003e\n        \u003cp\u003eThree 8\" drivers produce combined cone area between a single 12\" and a single 15\" while keeping individual mounting depth at 10.5\". A level of output that no single 8\" enclosure can approach, from a box that fits where large-format drivers cannot.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eShallow Profile, High Output\u003c\/h4\u003e\n        \u003cp\u003eAt 10\" tall and 12\" deep, the P8T-S produces large-driver output from a profile that fits behind seats and across trunk floors where a 15\" ported box would be completely impractical.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eWide Bass Dispersion\u003c\/h4\u003e\n        \u003cp\u003eThree drivers spaced across a 29\" baffle produce the widest bass dispersion in the Performance Series lineup. Low-frequency output is distributed evenly across the full width of the vehicle cabin.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003e0.45 ft³ Per Driver — Correctly Sized\u003c\/h4\u003e\n        \u003cp\u003eEach chamber puts its driver in the center of the recommended sealed range for most 8\" subwoofers. No damping material needed. No volume correction required. Three correctly-sized sealed chambers.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Construction --\u003e\n  \u003cdiv class=\"px-section\"\u003e\n    \u003ch2\u003eConstruction: Three Driver Bays, One Build Standard\u003c\/h2\u003e\n    \u003cp\u003eThe P8T-S uses the same Langboard Elite MDF, V-groove and dado joinery, and in-house terminal cup construction as every enclosure in the Proline X Performance Series. Three driver bays require more internal bracing than a single or dual driver build — the P8T-S addresses this with heavy strategic bracing throughout the shared interior that controls panel resonance at the structure level.\u003c\/p\u003e\n\n    \u003ch3\u003eLangboard Elite MDF — Named, Verified, Documented\u003c\/h3\u003e\n    \u003cp\u003eEvery panel is cut from \u003cstrong\u003eLangboard Elite MDF — 3\/4\" (18mm)\u003c\/strong\u003e, a named, mill-documented panel stock produced in the United States. The specifications below are pulled directly from Langboard's published mill data.\u003c\/p\u003e\n\n    \u003cdiv class=\"px-highlight\"\u003e\n      \u003ch3\u003eLangboard Elite — Published Mill Data\u003c\/h3\u003e\n      \u003cp\u003e\u003cstrong\u003eDensity:\u003c\/strong\u003e 48.5 lbs\/ft³ — higher density means less porosity, better screw retention, and reduced resonance\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eInternal Bond:\u003c\/strong\u003e 200 psi — resistance to delamination under sustained bass pressure cycling\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eModulus of Elasticity:\u003c\/strong\u003e 410,000 psi — panel stiffness under load; less flex means less resonance\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eFace Screw Holding:\u003c\/strong\u003e 325 lbs — baffle hardware stays locked under vibration\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eEdge Screw Holding:\u003c\/strong\u003e 250 lbs — joint integrity at every panel edge connection\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003ch3\u003eV-Groove and Dado Joinery\u003c\/h3\u003e\n    \u003cp\u003eEvery panel joint uses \u003cstrong\u003eV-groove and dado joinery\u003c\/strong\u003e — CNC-cut interlocking grooves that mechanically lock panels before adhesive is applied. Three drivers in sealed alignment demand consistent joint integrity across every panel — a single air leak compromises the acoustic seal on the affected chamber. Every seam on the P8T-S is mechanically locked before adhesive is applied.\u003c\/p\u003e\n\n    \u003ch3\u003eSingle Terminal Cup — All Three Drivers Internal\u003c\/h3\u003e\n    \u003cp\u003eThe P8T-S uses a single \u003cstrong\u003eABS\/Carbon Fiber Composite recessed terminal cup\u003c\/strong\u003e built in-house at our Tennessee facility. All three drivers are wired internally to the cup with stainless steel hardware, aluminum landing plates, and copper ring terminals, pre-wired with \u003cstrong\u003e12g OFC speaker wire\u003c\/strong\u003e. All three drivers must be run at the same impedance — confirm your amplifier output and driver impedances match before wiring.\u003c\/p\u003e\n\n    \u003cdiv class=\"px-grid\"\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eShopSabre CNC Routers\u003c\/h4\u003e\n        \u003cp\u003eEvery panel is machine-cut on ShopSabre industrial CNC routers. All three driver cutouts are machined to identical diameter and position. Consistent geometry across every unit.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eHand-Assembled in Tennessee\u003c\/h4\u003e\n        \u003cp\u003eEvery enclosure is hand-assembled at our Tennessee facility and inspected before it ships. No overseas manufacturing. No batch assembly shortcuts.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eDark Gray Trunkliner or Plush Black\u003c\/h4\u003e\n        \u003cp\u003eBoth finish options are professionally applied. Dark Gray Trunkliner blends with factory trunk materials. Plush Black delivers the traditional aftermarket look. Both are durably bonded for long-term wear.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eShipping Included\u003c\/h4\u003e\n        \u003cp\u003eNo freight charges at checkout. The price you see is the price you pay. The enclosure ships assembled and ready to install.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Fitment --\u003e\n  \u003cdiv class=\"px-section\"\u003e\n    \u003ch2\u003eFitment Guide\u003c\/h2\u003e\n    \u003cp\u003eThe P8T-S spans \u003cstrong\u003e29\" wide\u003c\/strong\u003e — sized to fit across most full-size trunk floors and behind most rear seats in full-size sedans and trucks. At \u003cstrong\u003e10\" tall and 12\" deep\u003c\/strong\u003e, it clears most behind-seat depth constraints that would eliminate a larger enclosure from consideration.\u003c\/p\u003e\n\n    \u003ch3\u003eDimensional Specifications\u003c\/h3\u003e\n    \u003cdiv class=\"px-highlight\"\u003e\n      \u003cp\u003e\u003cstrong\u003eExternal Dimensions:\u003c\/strong\u003e 29\" W x 10\" H x 12\" D\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eNet Internal Volume:\u003c\/strong\u003e 1.35 ft³ (0.45 ft³ per driver)\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eTuning Frequency:\u003c\/strong\u003e N\/A — Sealed\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eSubwoofer Cutout:\u003c\/strong\u003e 7.25\"\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eMax Mounting Depth:\u003c\/strong\u003e 10.5\"\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eFront Panel Thickness:\u003c\/strong\u003e 0.75\" Single Baffle\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003ch3\u003eDriver Compatibility\u003c\/h3\u003e\n    \u003cp\u003eThe P8T-S accommodates any 8\" subwoofer with a cutout diameter at or below \u003cstrong\u003e7.25\"\u003c\/strong\u003e and a mounting depth at or below \u003cstrong\u003e10.5\"\u003c\/strong\u003e. All three drivers must be the same model and impedance. Verify published specifications before ordering.\u003c\/p\u003e\n\n    \u003ch3\u003eCompatible Drivers\u003c\/h3\u003e\n    \u003cp\u003eThe following drivers are available from Audio Intensity and are compatible with the P8T-S:\u003c\/p\u003e\n    \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/image-dynamics-id8-v4-8inch-subwoofer\"\u003eImage Dynamics ID8 V4 →\u003c\/a\u003e\n    \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/prodigy-audio-8-inch-subwoofer-nb2-series\"\u003eProdigy NB2-8D4 →\u003c\/a\u003e\n    \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/image-dynamics-idq8d2-v4-8inch-subwoofer\"\u003eImage Dynamics IDQ8 V4 →\u003c\/a\u003e\n    \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/prodigy-audio-8-inch-subwoofer-nb5-series\"\u003eProdigy NB5-8D4 →\u003c\/a\u003e\n    \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/arc-audio-arc-series-8-subwoofer\"\u003eArc Audio Arc Series 8\" →\u003c\/a\u003e\n    \u003cp style=\"font-size:0.9em; color:#64748b; margin-top:12px;\"\u003eAlways verify cutout diameter and mounting depth against your specific driver's published specifications before ordering. All three drivers must be run at the same impedance.\u003c\/p\u003e\n\n    \u003ch3\u003eIdeal Install Applications\u003c\/h3\u003e\n    \u003cdiv class=\"px-grid\"\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eRear Deck Builds\u003c\/h4\u003e\n        \u003cp\u003eAt 10\" tall and 12\" deep, the P8T-S is one of the few multi-driver enclosures viable for rear deck installations in sedans where deck depth accommodates the 10.5\" max mounting depth.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eBehind Rear Seat\u003c\/h4\u003e\n        \u003cp\u003eThe 10\" height and 12\" depth fit behind most rear seats in full-size sedans and trucks. The 29\" width spans most rear floor openings in full-size vehicles without obstructing access to the cargo area.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eShallow Trunk Builds\u003c\/h4\u003e\n        \u003cp\u003eFor vehicles where trunk depth is the limiting factor but width is not — the P8T-S produces large-driver output from a 12\" deep footprint that larger ported enclosures cannot match.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eHigh-Excursion Driver Builds\u003c\/h4\u003e\n        \u003cp\u003eThe 10.5\" max mounting depth is the deepest specification in the triple 8\" format. Competition-grade 8\" motors that will not fit shallower enclosures are viable candidates for the P8T-S.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- CTA --\u003e\n  \u003cdiv class=\"px-cta\"\u003e\n    \u003ch2\u003eTriple 8\" Output. Shallow Profile. Tennessee-Built.\u003c\/h2\u003e\n    \u003cp\u003eThe Proline X P8T-S delivers combined triple 8\" output from an enclosure that fits where large-format drivers cannot. Langboard Elite MDF. V-groove and dado joinery. In-house terminal cup. Hand-assembled in Tennessee and inspected before it ships.\u003c\/p\u003e\n    \u003cp\u003eThree drivers. Sealed accuracy. Combined cone area between a 12\" and a 15\" — in a 12\" deep box. \u003cstrong\u003e$199.99 Dark Gray Trunkliner. $209.99 Plush Black.\u003c\/strong\u003e Shipping included.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Dark Gray Trunkliner","offer_id":43148119965785,"sku":"P8T-S III G","price":199.99,"currency_code":"USD","in_stock":true},{"title":"Plush Black","offer_id":43148119998553,"sku":"P8T-S III B","price":209.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-p8t-s-triple-8-sealed-subwoofer-enclosure-v3subwoofer-enclosuresproline-x-5415652.jpg?v=1773362889","url":"https:\/\/audiointensity.com\/products\/proline-x-p8t-s-triple-8-sealed-subwoofer-enclosure-v3","provider":"Audio Intensity","version":"1.0","type":"link"}