{"product_id":"proline-x-p8-s-single-8-sealed-subwoofer-enclosure-v3","title":"Proline X P8-S | Single 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 P8-S\u003c\/p\u003e\n    \u003cp class=\"px-subtitle\"\u003eSingle 8\" Sealed Subwoofer Enclosure | V3\u003c\/p\u003e\n    \u003cdiv class=\"px-badges\"\u003e\n      \u003cspan class=\"px-badge\"\u003e0.45 ft³ Net\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003eSealed Alignment\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003e0.75\" Single Baffle\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003e6.125\" 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\u003eAccurate Bass. Compact Footprint. No Compromises on Build Quality.\u003c\/h2\u003e\n    \u003cp\u003eThe \u003cstrong\u003eProline X P8-S\u003c\/strong\u003e is a single 8\" sealed enclosure built for installs where accuracy and controlled bass response matter more than raw output. Sealed alignment on an 8\" driver produces tight, transient-accurate low frequencies that integrate cleanly with a front stage — no port resonance, no boost peak, no frequency-specific coloration. The response is flat and predictable, which makes it easy to tune with a DSP or amplifier bass control and gives you a bass foundation that works with the music rather than over it.\u003c\/p\u003e\n    \u003cp\u003eAt \u003cstrong\u003e13\" wide, 10\" tall, and 10.5\" deep\u003c\/strong\u003e, the P8-S fits behind most rear seats, under most truck bench seats, and in trunk corners that a larger enclosure would not clear. The \u003cstrong\u003e6.125\" max mounting depth\u003c\/strong\u003e accommodates the majority of standard 8\" drivers including high-excursion SQ-oriented motors that would exceed the depth limit on shallower boxes.\u003c\/p\u003e\n    \u003cp\u003eEvery panel is CNC-cut from \u003cstrong\u003eLangboard Elite MDF\u003c\/strong\u003e to exact internal volume and assembled by hand in our Tennessee facility. A single recessed \u003cstrong\u003eABS\/Carbon Fiber Composite terminal cup\u003c\/strong\u003e handles wiring, pre-wired with \u003cstrong\u003e12g OFC speaker wire\u003c\/strong\u003e. Finish options are Dark Gray Trunkliner or Plush Black. Shipping is included.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Why Sealed --\u003e\n  \u003cdiv class=\"px-section\"\u003e\n    \u003ch2\u003eWhy Sealed for an 8\" SQ Build\u003c\/h2\u003e\n    \u003cp\u003eThe 8\" driver occupies a specific role in car audio — it is the preferred size for sound quality competition and critical listening installs because its low moving mass allows it to start and stop faster than larger drivers. Pairing that speed advantage with a sealed enclosure preserves the transient accuracy that makes the 8\" format valuable in the first place. A ported 8\" produces more output but trades some of that precision for efficiency. The P8-S is built for the listener who wants the 8\" to do what it does best.\u003c\/p\u003e\n    \u003cp\u003eAt \u003cstrong\u003e0.45 ft³ net\u003c\/strong\u003e, the P8-S puts most standard 8\" drivers in the middle of their recommended sealed range — not undersized, not oversized. No damping material required to correct an oversized box. No excursion limiting from a box that is too small. The volume is matched to the driver category.\u003c\/p\u003e\n    \u003cdiv class=\"px-grid\"\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eTransient Accuracy\u003c\/h4\u003e\n        \u003cp\u003eSealed alignment allows the driver to start and stop precisely with the music. Bass notes have distinct attack and decay. The P8-S preserves the speed advantage that makes the 8\" format the preferred choice for SQ competition and critical listening.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eFlat, Predictable Response\u003c\/h4\u003e\n        \u003cp\u003eNo port resonance. No tuning peak. No frequency-specific coloration. The P8-S produces a smooth, controlled rolloff below resonance that integrates cleanly with a front stage and responds accurately to DSP correction.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eDSP-Friendly Alignment\u003c\/h4\u003e\n        \u003cp\u003eSealed enclosures exhibit a predictable 12 dB\/octave rolloff that responds accurately to DSP bass boost and crossover adjustments. If you are running a Goldhorn DSP or any active processor, sealed is the alignment that gives you the most control over the final response.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003e0.45 ft³ — Correctly Sized\u003c\/h4\u003e\n        \u003cp\u003eMost 8\" drivers intended for sealed alignment specify optimal volumes between 0.35 ft³ and 0.60 ft³. The P8-S lands in the center of that range, providing universal compatibility without requiring volume correction or damping material.\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: Built to the Same Standard as Every Proline X Enclosure\u003c\/h2\u003e\n    \u003cp\u003eThe P8-S uses the same construction methodology as every enclosure in the Proline X Performance Series. Langboard Elite MDF. V-groove and dado joinery. In-house terminal cup. Hand-assembled in Tennessee. The only variables between SKUs are dimensions, volume, and alignment — the build quality is consistent across the lineup.\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. Generic MDF descriptions like \"high-density\" or \"premium\" carry no defined standard. Langboard Elite carries published mill data that is verifiable and consistent sheet to sheet.\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. The dado creates a tongue-and-groove mechanical interlock that resists shear forces regardless of glue condition. Every corner is locked. Every seam is airtight. Sealed enclosures in particular depend on joint integrity — a single air leak degrades bass output and response accuracy. The P8-S does not leak.\u003c\/p\u003e\n\n    \u003ch3\u003eIn-House ABS\/Carbon Fiber Composite Terminal Cup\u003c\/h3\u003e\n    \u003cp\u003eThe terminal cup is built in-house at our Tennessee facility. The \u003cstrong\u003eABS\/Carbon Fiber Composite recessed cup\u003c\/strong\u003e features stainless steel hardware, aluminum landing plates, and copper ring terminals, pre-wired with \u003cstrong\u003e12g OFC speaker wire\u003c\/strong\u003e. The recessed mount protects terminals from cargo contact. Copper ring terminals provide a clean, corrosion-resistant connection point that does not loosen over time under vibration.\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. Consistent geometry, no hand-cut variance, no gaps at the joints. The internal volume of every P8-S is identical to spec.\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 for a clean, stealth appearance. Plush Black delivers the traditional aftermarket look. Both are durably bonded.\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 P8-S is one of the more compact single 8\" sealed enclosures in the Performance Series. At \u003cstrong\u003e13\"W x 10\"H x 10.5\"D\u003c\/strong\u003e it fits behind most rear seats in compact and mid-size vehicles and under most truck bench seats without modification.\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 13\" W x 10\" H x 10.5\" D\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eNet Internal Volume:\u003c\/strong\u003e 0.45 ft³\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 6.125\"\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 P8-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\u003e6.125\"\u003c\/strong\u003e. Verify both dimensions against your driver's 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 P8-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.\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\u003eUnder Truck Bench Seat\u003c\/h4\u003e\n        \u003cp\u003eAt 10.5\" deep and 10\" tall, the P8-S fits under most full-size truck bench seats without modification. A clean, invisible install that does not sacrifice cab space.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eBehind Rear Seat\u003c\/h4\u003e\n        \u003cp\u003eThe compact footprint fits behind most rear seats in compact and mid-size sedans. The 13\" width leaves room for spare tire access in most configurations.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eSQ and Competition Builds\u003c\/h4\u003e\n        \u003cp\u003eSealed alignment and 0.45 ft³ net volume make the P8-S the correct enclosure for 8\" drivers used in sound quality competition builds where accuracy and integration with the front stage are the priority.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eDSP-Controlled Systems\u003c\/h4\u003e\n        \u003cp\u003eThe flat, predictable sealed rolloff makes the P8-S the preferred enclosure format for systems running a Goldhorn DSP or any active processor. Sealed alignment responds accurately to DSP correction and equalization.\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\u003eTight Bass. Tennessee-Built. Shipping Included.\u003c\/h2\u003e\n    \u003cp\u003eThe Proline X P8-S is a single 8\" sealed enclosure built to a spec, not a price point. 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\u003eIf you are building an SQ system, running a DSP, or just need accurate controlled bass from a compact footprint — this is the correct enclosure. \u003cstrong\u003e$129.99 Dark Gray Trunkliner. $139.99 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":43144801288281,"sku":"P8-S III G","price":129.99,"currency_code":"USD","in_stock":true},{"title":"Plush Black","offer_id":43144801321049,"sku":"P8-S III B","price":139.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-p8-s-single-8-sealed-subwoofer-enclosure-v3subwoofer-enclosuresproline-x-6759569.png?v=1773272955","url":"https:\/\/audiointensity.com\/products\/proline-x-p8-s-single-8-sealed-subwoofer-enclosure-v3","provider":"Audio Intensity","version":"1.0","type":"link"}