{"product_id":"proline-x-p12d-p-dual-12-ported-subwoofer-enclosure-v3","title":"Proline X P12D-P | Dual 12\" Ported 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 P12D-P\u003c\/p\u003e\n    \u003cp class=\"px-subtitle\"\u003eDual 12\" Ported Subwoofer Enclosure | V3\u003c\/p\u003e\n    \u003cdiv class=\"px-badges\"\u003e\n      \u003cspan class=\"px-badge\"\u003e2.75 ft³ Net\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003e36Hz Tuning\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003ePorted Bass Reflex\u003c\/span\u003e\n      \u003cspan class=\"px-badge\"\u003e7.125\" 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\u003eDual 12\" Ported Output. The Highest Output Configuration in the Performance Series.\u003c\/h2\u003e\n    \u003cp\u003eThe \u003cstrong\u003eProline X P12D-P\u003c\/strong\u003e is a dual 12\" slot-ported enclosure built for installs that demand maximum output and deep low-frequency extension. At \u003cstrong\u003e2.75 ft³ net\u003c\/strong\u003e and tuned to \u003cstrong\u003e36Hz\u003c\/strong\u003e, this enclosure gives two 12\" drivers the combined air space and port geometry to produce output at the top end of what the Performance Series delivers. Two 12\" drivers in ported alignment at 36Hz produce combined output that fills large vehicles and dedicated listening spaces — output that requires custom fabrication or a purpose-built SPL setup to exceed.\u003c\/p\u003e\n    \u003cp\u003eAt \u003cstrong\u003e32\" wide, 15\" tall, and 15.3\" deep\u003c\/strong\u003e, the P12D-P is a dedicated trunk build. Both the 32\" width and 15.3\" depth are critical dimensions — measure your available trunk space carefully before ordering. The \u003cstrong\u003e7.125\" max mounting depth\u003c\/strong\u003e covers the majority of standard 12\" drivers. A single terminal cup handles both drivers internally — both must be run at the same impedance.\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. Port geometry is CNC-cut to exact dimensions — tuning is consistent unit to unit. Finish options are Dark Gray Trunkliner or Plush Black. Shipping is included.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Why Ported --\u003e\n  \u003cdiv class=\"px-section\"\u003e\n    \u003ch2\u003eWhy Dual 12\" Ported at 36Hz\u003c\/h2\u003e\n    \u003cp\u003eThe dual 12\" ported configuration at 36Hz is the highest-output enclosure in the Performance Series lineup. Two 12\" drivers in ported alignment produce combined output that exceeds what most single large-format drivers in ported enclosures can match at equivalent amplifier power levels. The 36Hz tuning point places the port output peak in the upper sub-bass range — where impact is most audible and where the combined efficiency of two ported drivers reaches its maximum.\u003c\/p\u003e\n    \u003cp\u003eAt 2.75 ft³ net, each driver has adequate air space to operate efficiently in ported alignment. Port velocity is controlled at this volume — no chuffing, no audible port noise at real-world listening levels. Both drivers operate at the same correctly-sized acoustic load at the same tuning frequency, which produces consistent output and consistent port behavior across the full output range of the enclosure.\u003c\/p\u003e\n    \u003cdiv class=\"px-grid\"\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eMaximum Performance Series Output\u003c\/h4\u003e\n        \u003cp\u003eTwo 12\" drivers in ported alignment at 36Hz represent the peak output configuration in the Performance Series. Combined efficiency at the tuning point produces bass output that no other enclosure in the lineup approaches.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003e36Hz — Deep and Impactful\u003c\/h4\u003e\n        \u003cp\u003e36Hz places the efficiency peak at the upper sub-bass range where bass impact is most audible. Strong output from the mid-30s through the upper bass range without port velocity issues at the 2.75 ft³ volume this enclosure provides.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003e2.75 ft³ — Room to Breathe\u003c\/h4\u003e\n        \u003cp\u003eEach driver has adequate air space in ported alignment. Port velocity stays controlled at real-world listening levels. Both drivers operate efficiently at 36Hz without the enclosure working against them or port noise becoming audible.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eWide Bass Dispersion\u003c\/h4\u003e\n        \u003cp\u003eTwo drivers spaced across a 32\" baffle produce the widest bass dispersion in the Performance Series ported lineup. Low-frequency output is distributed evenly across the full cabin width at output levels that demand it.\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: Maximum Volume, CNC-Cut Port Geometry, Single Terminal Cup\u003c\/h2\u003e\n    \u003cp\u003eThe P12D-P uses the same Langboard Elite MDF and V-groove and dado joinery construction as every enclosure in the Proline X Performance Series. At 32\" wide and 15.3\" deep, this is the largest enclosure in the Performance Series lineup — joint integrity and panel rigidity across every panel are critical at this scale. Port geometry is CNC-cut to exact dimensions. A single terminal cup handles both drivers internally.\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. On the largest enclosure in the Performance Series lineup, joint integrity across 32\" wide panels and 15.3\" deep side walls is the difference between an enclosure that holds its acoustic performance over years of sustained high-output use and one that does not. Every joint on the P12D-P is mechanically locked before adhesive is applied.\u003c\/p\u003e\n\n    \u003ch3\u003eSingle Terminal Cup — Same Impedance Required\u003c\/h3\u003e\n    \u003cp\u003eThe P12D-P uses a single \u003cstrong\u003eABS\/Carbon Fiber Composite recessed terminal cup\u003c\/strong\u003e built in-house at our Tennessee facility. Both 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. Both drivers must be run at the same impedance — confirm your amplifier output and driver impedances before wiring.\u003c\/p\u003e\n\n    \u003cdiv class=\"px-grid\"\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eCNC-Cut Port Geometry\u003c\/h4\u003e\n        \u003cp\u003ePort length, cross-section, and position are machine-cut to exact dimensions on ShopSabre CNC routers. Tuning frequency is consistent unit to unit — no hand-cut variance in port dimensions across the largest enclosure in the lineup.\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 — regardless of enclosure size.\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 P12D-P is the largest enclosure in the Performance Series. At \u003cstrong\u003e32\"W x 15\"H x 15.3\"D\u003c\/strong\u003e, both the width and depth are critical dimensions. This is a dedicated trunk build — measure both dimensions carefully before ordering.\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 32\" W x 15\" H x 15.3\" D\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eNet Internal Volume:\u003c\/strong\u003e 2.75 ft³\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eTuning Frequency:\u003c\/strong\u003e 36Hz\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eSubwoofer Cutout:\u003c\/strong\u003e 11.15\"\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eMax Mounting Depth:\u003c\/strong\u003e 7.125\"\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 P12D-P accommodates any 12\" subwoofer with a cutout diameter at or below \u003cstrong\u003e11.15\"\u003c\/strong\u003e and a mounting depth at or below \u003cstrong\u003e7.125\"\u003c\/strong\u003e. Both 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 P12D-P:\u003c\/p\u003e\n    \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/prodigy-audio-12-inch-subwoofer-nb2-series\"\u003eProdigy NB2-12D4 →\u003c\/a\u003e\n    \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/image-dynamics-id12-v4-12-inch-subwoofer\"\u003eImage Dynamics ID12 V4 →\u003c\/a\u003e\n    \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/prodigy-audio-12-inch-subwoofer-nb3-series\"\u003eProdigy NB3-12D4 →\u003c\/a\u003e\n    \u003ca class=\"px-driver-link\" href=\"https:\/\/audiointensity.com\/products\/arc-audio-arc-series-12-subwoofer\"\u003eArc Audio ARC12 D2 →\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. Both 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\u003eDedicated Trunk Build\u003c\/h4\u003e\n        \u003cp\u003eAt 32\" wide and 15.3\" deep, the P12D-P requires a dedicated trunk installation with adequate space for both dimensions. Measure your available trunk width and depth before ordering — both are critical.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eMaximum Performance Series Output\u003c\/h4\u003e\n        \u003cp\u003eThe P12D-P is the highest-output enclosure in the Performance Series lineup. For builds where maximum output from a production enclosure is the goal — this is the correct choice.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eLarge Vehicle High-Output Systems\u003c\/h4\u003e\n        \u003cp\u003eFull-size sedans, trucks, and SUVs with adequate trunk dimensions are the natural home for the P12D-P. The combined output of two 12\" drivers in ported alignment fills large acoustic spaces that smaller configurations cannot pressurize effectively.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"px-card\"\u003e\n        \u003ch4\u003eStep Up From Sealed\u003c\/h4\u003e\n        \u003cp\u003eFor builds running the P12D-S that need significantly more output and lower frequency extension — the P12D-P is the direct step up. Same driver compatibility, the full output advantage of ported alignment at 36Hz.\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\u003eMaximum Dual 12\" Output. Tennessee-Built. Shipping Included.\u003c\/h2\u003e\n    \u003cp\u003eThe Proline X P12D-P is the highest-output enclosure in the Performance Series. Langboard Elite MDF. V-groove and dado joinery. CNC-cut port geometry. In-house terminal cup. Hand-assembled in Tennessee and inspected before it ships.\u003c\/p\u003e\n    \u003cp\u003eTwo drivers. Ported efficiency. The peak output configuration in the Proline X Performance Series lineup. \u003cstrong\u003e$269.99 Dark Gray Trunkliner. $279.99 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":43157680455769,"sku":"P12D-P III-G","price":269.99,"currency_code":"USD","in_stock":true},{"title":"Plush Black","offer_id":43157680488537,"sku":"P12D-P III-B","price":279.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/products\/proline-x-performance-p12d-p-ported-enclosure-for-dual-12-subwooferssubwoofer-enclosuresproline-x-723960.jpg?v=1761969165","url":"https:\/\/audiointensity.com\/products\/proline-x-p12d-p-dual-12-ported-subwoofer-enclosure-v3","provider":"Audio Intensity","version":"1.0","type":"link"}