Proline X Performance P12D-P Ported Enclosure for Dual 12" Subwoofers|Proline X|Audio Intensity

Proline X Subwoofer Enclosures Proline X Performance P12D-P Ported Enclosure for Dual 12" Subwoofers

Proline X

Proline X P12D-P | Dual 12" Ported Subwoofer Enclosure | V3

SKU: P12D-P III-G

QUICK SPECS

Best For: Dual 12" ported installs — maximum output, deep low-frequency extension
Volume: 2.75 ft³ Net
Tuning: 36Hz
Sonic Character: High output, extended low-frequency, ported efficiency

Shipping Included No freight charges at checkout. What you see is what you pay.

Built in Tennessee CNC cut from 3/4" Langboard Elite MDF. V-groove and dado joinery.

Advanced Terminal Cup Built in-house. ABS/Carbon Fiber. Stainless steel hardware. Copper ring terminals.

$ 269.99

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Proline X P12D-P | Dual 12" Ported Subwoofer Enclosure | V3

Enclosure Type Ported

External Dimensions 32" x 15" x 15.3"

Net Volume 2.75 cu ft

Tuning Frequency 36 hz

Cutout Diameter 11.15"

Front Panel Thickness .75"

Max Mounting Depth 7.125"

INSTALLER'S TAKE

The 2.75 ft³ net volume gives dual 12" drivers real room to operate in a ported alignment. This is not a compressed box tuned tight to hit a compact dimension — the internal volume is sized to let both drivers work efficiently at the 36Hz tuning point. The result is output that reflects what the drivers are actually capable of.
At 32" wide and 15.3" deep this is a dedicated trunk build. Measure both dimensions carefully before ordering — width and depth are both critical here. The 7.125" max mounting depth covers most standard 12" drivers. Single terminal cup handles both drivers internally — both must be run at the same impedance. Confirm your amplifier output and driver impedances before wiring.

Product Details

Proline X P12D-P

Dual 12" Ported Subwoofer Enclosure | V3

2.75 ft³ Net 36Hz Tuning Ported Bass Reflex 7.125" Max Depth Langboard Elite MDF Built in Tennessee

Dual 12" Ported Output. The Highest Output Configuration in the Performance Series.

The Proline X P12D-P is a dual 12" slot-ported enclosure built for installs that demand maximum output and deep low-frequency extension. At 2.75 ft³ net and tuned to 36Hz, 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.

At 32" wide, 15" tall, and 15.3" deep, 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 7.125" max mounting depth covers the majority of standard 12" drivers. A single terminal cup handles both drivers internally — both must be run at the same impedance.

Every panel is CNC-cut from Langboard Elite MDF 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.

Why Dual 12" Ported at 36Hz

The 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.

At 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.

Maximum Performance Series Output

Two 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.

36Hz — Deep and Impactful

36Hz 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.

2.75 ft³ — Room to Breathe

Each 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.

Wide Bass Dispersion

Two 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.

Construction: Maximum Volume, CNC-Cut Port Geometry, Single Terminal Cup

The 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.

Langboard Elite MDF — Named, Verified, Documented

Every panel is cut from Langboard Elite MDF — 3/4" (18mm), a named, mill-documented panel stock produced in the United States. The specifications below are pulled directly from Langboard's published mill data.

Langboard Elite — Published Mill Data

Density: 48.5 lbs/ft³ — higher density means less porosity, better screw retention, and reduced resonance

Internal Bond: 200 psi — resistance to delamination under sustained bass pressure cycling

Modulus of Elasticity: 410,000 psi — panel stiffness under load; less flex means less resonance

Face Screw Holding: 325 lbs — baffle hardware stays locked under vibration

Edge Screw Holding: 250 lbs — joint integrity at every panel edge connection

V-Groove and Dado Joinery

Every panel joint uses V-groove and dado joinery — 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.

Single Terminal Cup — Same Impedance Required

The P12D-P uses a single ABS/Carbon Fiber Composite recessed terminal cup 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 12g OFC speaker wire. Both drivers must be run at the same impedance — confirm your amplifier output and driver impedances before wiring.

CNC-Cut Port Geometry

Port 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.

Hand-Assembled in Tennessee

Every enclosure is hand-assembled at our Tennessee facility and inspected before it ships. No overseas manufacturing. No batch assembly shortcuts — regardless of enclosure size.

Dark Gray Trunkliner or Plush Black

Both 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.

Shipping Included

No freight charges at checkout. The price you see is the price you pay. The enclosure ships assembled and ready to install.

Fitment Guide

The P12D-P is the largest enclosure in the Performance Series. At 32"W x 15"H x 15.3"D, both the width and depth are critical dimensions. This is a dedicated trunk build — measure both dimensions carefully before ordering.

Dimensional Specifications

External Dimensions: 32" W x 15" H x 15.3" D

Net Internal Volume: 2.75 ft³

Tuning Frequency: 36Hz

Subwoofer Cutout: 11.15"

Max Mounting Depth: 7.125"

Front Panel Thickness: 0.75" Single Baffle

Driver Compatibility

The P12D-P accommodates any 12" subwoofer with a cutout diameter at or below 11.15" and a mounting depth at or below 7.125". Both drivers must be the same model and impedance. Verify published specifications before ordering.

Compatible Drivers

The following drivers are available from Audio Intensity and are compatible with the P12D-P:

Prodigy NB2-12D4 → Image Dynamics ID12 V4 → Prodigy NB3-12D4 → Arc Audio ARC12 D2 →

Always verify cutout diameter and mounting depth against your specific driver's published specifications before ordering. Both drivers must be run at the same impedance.

Ideal Install Applications

Dedicated Trunk Build

At 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.

Maximum Performance Series Output

The 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.

Large Vehicle High-Output Systems

Full-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.

Step Up From Sealed

For 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.

Maximum Dual 12" Output. Tennessee-Built. Shipping Included.

The 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.

Two drivers. Ported efficiency. The peak output configuration in the Proline X Performance Series lineup. $269.99 Dark Gray Trunkliner. $279.99 Plush Black. Shipping included.

Specifications

Material	Langboard Elite MDF, 3/4" (18mm)
Enclosure Type	Slot-Ported Bass Reflex
Net Internal Volume	2.75 ft³
Tuning Frequency	36Hz
External Dimensions	32" W x 15" H x 15.3" D
Subwoofer Cutout	11.15"
Max Mounting Depth	7.125"
Front Panel Thickness	0.75" Single Baffle
Finish	Dark Gray Trunkliner / Plush Black (+$10)
Terminal Cup	ABS/Carbon Fiber Composite, recessed mount, stainless hardware, copper ring terminals — single cup, dual driver internal wiring
Wiring	Pre-wired 12g OFC speaker wire
Warranty	1-Year Limited

Materials

Material

Built From a Spec Sheet, Not a Sales Sheet

Every Proline X Performance Series enclosure is CNC-cut from Langboard Elite MDF — 3/4" (18mm) panels produced to published mill specifications. Most enclosure manufacturers source generic MDF without published data. We can tell you the internal bond rating, the modulus of elasticity, the modulus of rupture, and the face and edge screw holding strength for every panel in this enclosure — because we chose the material based on those numbers, not on price or availability.

Langboard Elite is produced in the United States. The specifications below are pulled directly from Langboard's published mill data and are verifiable. This is the same panel stock used in our full Proline X lineup.

Specifications

Langboard Elite MDF — Published Mill Data

Property	Value	Why It Matters
Panel Stock	Langboard Elite MDF	Named, verifiable panel source — not generic "high-density MDF"
Thickness	3/4" (18mm)	Industry standard for subwoofer enclosures; panels below this flex under pressure
Density	48.5 lbs/ft³	Higher density = less porosity, better screw retention, reduced resonance
Internal Bond	200 psi	Measures resistance to delamination under sustained internal pressure — the most enclosure-relevant spec on this sheet
Modulus of Rupture (MOR)	4,200 psi	Bending strength before the panel breaks — relevant for larger unsupported baffle spans
Modulus of Elasticity (MOE)	410,000 psi	Stiffness under load; higher MOE means less panel flex under bass pressure, less resonance
Face Screw Holding	325 lbs	How firmly the panel surface holds a screw; critical for baffle joint integrity over time
Edge Screw Holding	250 lbs	Panel edge retention — relevant for every joint that isn't face-to-face

Internal Bond

200 psi — The Number That Actually Matters for Enclosures

The internal bond rating measures how well the MDF panel resists delamination under sustained pressure applied perpendicular to the face. In a subwoofer enclosure, every bass transient generates a pressure pulse that pushes outward on every panel simultaneously. A panel that begins to delaminate internally loses stiffness gradually — the symptoms are slow: a box that starts to sound softer, less defined, less punchy over months of use. 200 psi internal bond is the spec that determines how long this enclosure holds its acoustic integrity under daily use at real power levels.

Stiffness

410,000 psi MOE — Less Flex, Less Resonance

The modulus of elasticity measures panel stiffness — resistance to bending under load. A stiffer panel flexes less under the pressure generated by a high-excursion driver at volume. Panel flex is a source of acoustic coloration: the panel itself begins to radiate sound at its own resonant frequency, adding distortion to the output. 410,000 psi stiffness combined with V-groove and dado joinery means the panels stay rigid and the bracing controls resonance at the structure level — not the panel level. The bass you hear comes from the driver, not the box.

Screw Holding

325 lb Face / 250 lb Edge — Joints That Stay Locked

Screw holding strength determines how firmly the panel grips a fastener at the face and at the edge. This matters most at the baffle joint — where the front panel meets the side panels and where the driver is mounted. A panel with low screw holding strength allows fasteners to loosen over time under vibration, leading to air gaps at the joint and loss of acoustic seal. 325 lb face screw holding strength means the baffle hardware stays put. Combined with dado joinery and adhesive, the front panel on a Proline X Performance Series enclosure is not going anywhere.

Sourcing

Named Panel Stock — Not "Premium MDF"

The phrase "premium MDF" or "high-density MDF" appears on marketing copy for enclosures across every price point, from $40 to $400. It is not a specification — it is a description with no defined standard. Langboard Elite is a named, sourced, mill-documented product with published data. We name it in our copy because naming it holds us accountable to the spec. You can look up Langboard Elite independently, verify the numbers on this page, and confirm you are getting what we say you are getting. That is the point.

Why Proline X?

Most enclosures are built to a price point. Proline X is built to a spec. Every box starts with published-data MDF, gets CNC-cut to exact internal volume, and is assembled by hand in our Tennessee facility. The difference shows up in the measurements — and in how the box holds up two years into daily use.

CNC-Cut to Spec

Panels are machine-cut on ShopSabre CNC routers and joined with V-groove and dado joinery. Consistent geometry, no hand-cut variance, no gaps at the joints.