Proline X PO 8D-S W W7AE sealed wedge, front baffle with gloss black insert and pre-wired leads, 32 by 11 inches.

Proline X

Performance Optimized Wedge Sealed Dual 8" Enclosure | JL Audio 8W7AE

Q: Does this fit the JL Audio 8W7AE-3, and will any other 8 inch fit?

The 8W7AE-3, yes. The baffle is cut to 6.94 in (176 mm), JL's published mounting hole, under the 8.5 in (216 mm) frame. The 6.83 inch motor clears the raked rear panel with 4.50 inch to spare, and JL sells the 8W7AE in one version, a single 3 ohm coil, so there is no variant to choose. Run two so the chambers match.Any other 8, no. The airspace is built around the 8W7AE's 0.612 Qts and 17.4 liters of Vas, and most 8 inch drivers are far shallower than its 6.83 inch motor; a different woofer that happened to drop into the hole would not see the alignment printed on this page.

Q: Why 0.875 cubic feet per chamber, and what alignment does it target?

It is JL's own recommended sealed volume for the 8W7AE. On JL's published Fs 35.2 Hz, Qts 0.612 and Vas 17.4 liters it gives Qtc 0.798, system resonance 45.9 Hz and half power 41.3 Hz, exactly the figures JL prints for that box.Qtc 0.80 is a little above maximally flat: a small lift near resonance and a firm, punchy midbass. The flat box on the same figures would be 1.84 cubic feet, more than double, which is not a practical cabinet for one 8 inch driver.

Q: What amplifier power should I run, and how should I wire it?

JL rates the 8W7AE-3 at 500 watts RMS per driver, so target 350 to 500 watts RMS per driver at the final load.Each 8W7AE-3 has a single 3 ohm voice coil. Two in parallel present 1.5 ohms; two in series present 6 ohms. Use 1.5 ohms only if your amplifier is rated stable there; otherwise wire the pair in series for 6 ohms. Confirm your amplifier's minimum stable impedance first.

Q: Why the wedge angle, and why rear-firing into the trunk?

The seat-side face carries a 20 degree rake that matches the lean of a factory rear seat back, so the cabinet sits flush against it and the cargo space in front stays usable. The baffle is the vertical trunk-lid-side face, so the drivers fire rearward into the trunk cavity.The trunk acts as an acoustic extension for the sealed box, and the cabin adds real output below 50 Hz, so in-vehicle response runs deeper than the anechoic 41.3 Hz on this page.

Q: Why two separate chambers instead of one shared volume?

Two drivers sharing one sealed volume load each other: each driver's compression stroke becomes the pressure the other works against, which blurs the alignment either would have alone. A bonded full-height 3/4 inch divider gives each driver its own 0.875 cubic feet and its own polyfill.It also means a failure in one driver does not unload the other, and the alignment on this page is the alignment in each chamber, not an average across a shared box.

Q: What is the expected low-frequency extension?

Anechoic F3 is 41.3 Hz per chamber with system resonance at 45.9 Hz. Above Qtc 0.707 F3 sits below fc, so the response carries a small lift near resonance before it rolls off.Those figures exclude cabin gain. In a car the cabin's transfer function adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above.

Q: Do I need to add polyfill or damping?

No. Polyfill is already installed in both chambers as a light wall lining to control internal reflections, and the quantity is chosen so it does not change the acoustic volume.Do not add more. Packing a sealed box with fill makes it behave as though it were larger, which walks the alignment away from the 0.875 cubic feet per chamber this cabinet was built to.

Q: Is the driver included, and are the threaded inserts installed?

No driver. This is an enclosure only. You receive the cabinet finished in plush black carpet with the gloss black acrylic baffle insert, one side-mounted pre-wired terminal cup to both positions, the polyfill lining already in place, and stainless machine screws.The threaded inserts are already pressed: JL publishes a 7.39 inch bolt circle for the 8W7AE, so we drill to it at the shop. The pair of JL Audio 8W7AE-3 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 8 inch box.

SKU: PO 8D-S W W7AE BB

QUICK SPECS

Best For: Dual JL Audio 8W7AE-3 Trunk-Fit Builds
Net Volume: 0.875 cu ft per chamber (1.92 cu ft Gross Total)
Driver Match: Pair of JL Audio 8W7AE-3 (single 3 ohm), matched
Construction: Dual Chamber | Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | 1 Shared Terminal Cup | Threaded Inserts

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.

$ 299.99

Acrylic Insert Color

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

Performance Optimized Wedge Sealed Dual 8" Enclosure | JL Audio 8W7AE

More enclosures cut for JL Audio subwoofers: JL Audio Subwoofer Boxes

Enclosure Type Sealed

External Dimensions 32.00" W x 11" H x 16.83" D at base tapering to 12.83" D at top

Gross Volume 1.92 cu ft

Net Volume 1.75 cu ft

Shipping Weight 51 lbs

Front Panel Thickness 1.5"

INSTALLER'S TAKE

Built to JL's own sealed box, 0.875 cubic feet per chamber, Qtc 0.798. Butterworth on these numbers wants 1.84, a 29 inch box for one 8; JL's figure is the practical one and it is punchy, not boomy.

Two chambers at 0.875 each, pinned at the 32 inch cap and 11 tall, so it runs 16.83 deep at the base: deeper than it is tall. Measure the trunk floor first. Single 3 ohm coils: the pair is 1.5 ohms parallel or 6 series.

Cut is 6.94 (176 mm), JL's own mounting hole, and the inserts are pressed on JL's 7.39 bolt circle. It is sealed, so leave the polyfill as it is and run it at 500 watts or under per driver.

Product Details

Performance Optimized Wedge | Dual JL Audio 8W7AE-3

Dual 8" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design

0.875 ft3 Net per Chamber1.92 ft3 GrossQtc 0.80Two Separate Chambers32.00" x 11" x 12.83/16.83"Built in Tennessee

A Pair of JL Audio 8W7AE-3 in a Sealed Wedge

The 8W7AE-3 is the 8 inch of JL Audio's W7AE line: a single 3 ohm voice coil, 500 watts RMS, 19 mm of one-way excursion on 245 square centimeters of cone, and 6.83 inches of mounting depth on a 8.5 inch frame. That motor is deep for an 8, and it sets the shape of this cabinet. Every figure comes from JL Audio's published 8W7AE-3 parameters, and they hold together: Qes and Qms reproduce the printed Qts, and the 100 g moving mass and 0.204 mm/N compliance reproduce the 35.2 Hz resonance and 17.4 liter Vas.

0.875 cubic feet net per chamber on JL's published Fs 35.2 Hz, Qts 0.612 and Vas 17.4 liters: Qtc 0.798, system resonance 45.9 Hz, half power 41.3 Hz. Those are the figures JL prints for its own recommended sealed box, and this cabinet reproduces them. JL's own sealed recommendation for the 8W7AE is 0.875 cubic feet net, and this cabinet is built to it. The maximally flat box on the same figures would be 1.84 cubic feet, more than double, which is a 29 inch wide cabinet for one 8 inch driver.

Two Fully Separate Chambers

A bonded full-height 3/4 inch MDF divider splits the cabinet into two sealed chambers of 0.875 cubic feet net each, so every driver sees exactly the airspace it would have in the single wedge. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.

The cabinet is pinned at the 32 inch dual width cap and the ruled 11 inch dual 8 height, so the depth absorbs the airspace: 12.83 inches at the top and 16.83 at the base, deeper than it is tall. Measure the trunk floor before you order. One shared side-mounted terminal cup feeds both driver positions.

Trunk-Load Wedge Design Explained

The drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.

Seat-Side Face Matches Seat Lean

Angled face matches the roughly 20 degree factory seat lean.

Trunk-Lid-Side Face Fires the Woofer

Vertical baffle, cone firing rearward into the trunk cavity.

Trunk Cavity Loading

The trunk acts as an acoustic extension for a smoother presentation.

Preserves Trunk Cargo Space

The wedge tucks against the seat back and the space in front stays usable.

Engineered for a pair of JL Audio 8W7AE-3

Half power lands at 41.3 Hz anechoic, before any cabin gain. JL publishes the driver displacement, 1.7 liters, and it is taken out of the net figure for each driver.

Alignment Numbers (Per Chamber)

Driver (per chamber)	System Qtc	fc	F3
8W7AE-3, single 3 ohm	Qtc 0.798	45.9 Hz	41.3 Hz

Mounting Geometry

The baffle is cut to 6.94 in (176 mm), JL's published mounting hole, under the 8.5 in (216 mm) frame. The rear panel rakes 20 degrees, so the cavity deepens from 12.83 in at the top to 16.83 in at the base, and the 6.83 in motor clears it with 4.50 in to spare. JL publishes a 7.39 in (188 mm) bolt circle for the 8W7AE, so the threaded inserts are pressed at the shop on that circle and the driver bolts straight down with the stainless machine screws supplied.

What the Numbers Rest On

Langboard Elite MDF

Premium 3/4 in MDF throughout.

V-Groove and Dado Joinery

CNC cut V-grooves at every panel intersection, sides and divider seated in dados.

Double-Layer 1.5" Front Baffle

Two bonded 3/4 in MDF sheets at the driver face, the outer layer machined as a flush recess.

JL's Own Parameters

Fs 35.2 Hz, Qts 0.612, Qes 0.654, Qms 9.5, Vas 17.4 L, Sd 245 cm2, Mms 100 g, Cms 0.204 mm/N, Bl 9.7 N/A. Sensitivity 82.7 dB at 1 W / 1 m.

Wiring a pair of JL Audio 8W7AE-3 to Your Amplifier

Each 8W7AE-3 has a single 3 ohm voice coil. Two in parallel present 1.5 ohms; two in series present 6 ohms. Use 1.5 ohms only if your amplifier is rated stable there; otherwise wire the pair in series for 6 ohms. Confirm the final load against your amplifier's minimum stable impedance before powering the system.

Power handling is 500 watts RMS per driver, 1000 across the pair. Aim for roughly 350 to 500 watts per driver at the impedance you wire.

Built in Tennessee, Backed by Audio Intensity

Cut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet with the gloss black acrylic baffle insert, one shared pre-wired terminal cup, 12 gauge OFC to both driver positions. Polyfill wall lining installed. Threaded inserts pressed on JL's bolt circle, stainless machine screws in the box. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.

Dual JL Audio 8W7AE-3: Built to JL's Own Sealed Box

0.875 cubic feet net per chamber at Qtc 0.798, F3 41.3 Hz, cut direct fit and built to order in Tennessee.

Specifications

Specification	Value
Series	Proline X Performance Optimized Wedge
Compatible Driver	JL Audio 8W7AE-3, quantity 2. Direct fit
Configuration	Dual 8 inch, two separate chambers, sealed wedge
Mounting Position	Trunk or cargo area, tall face against the rear seat back
Firing Direction	Rearward into the trunk. Not a down fire design, no feet included
External Width	32.00 in, the dual width cap
External Height	11 in at the seat face
External Depth	16.83 in at the base, tapering to 12.83 in at the top
Internal Volume, Gross	1.92 cu ft total
Internal Volume, Net Acoustic	0.875 cu ft per chamber after the divider and JL's published 1.7 L displacement per driver
Driver Mounting Depth	6.83 in required; 4.50 in clearance above the motor against the raked rear panel
Alignment per chamber	Qtc 0.798, fc 45.9 Hz, F3 41.3 Hz anechoic
JL Recommended Enclosure	0.875 cu ft sealed (Qtc 0.798, F3 41.3 Hz), 1.0 cu ft ported
Woofer Opening	6.94 in (176 mm), two, JL's published mounting hole
Frame Outer Diameter	8.5 in (216 mm)
Bolt Circle	7.39 in (188 mm), JL spec; threaded inserts pressed
Driver Displacement	1.7 L / 0.06 cu ft, JL spec
Fs / Qts / Qes / Qms	35.2 Hz / 0.612 / 0.654 / 9.5
Vas / Mms / Cms / Bl	17.4 L / 100 g / 0.204 mm/N / 9.7 N/A
Driver Sd	245 cm2
Xmax	19 mm one way, JL spec (voice coil overhang method)
Driver Sensitivity	82.7 dB at 1 W / 1 m, JL spec
Driver Power Handling	500 W RMS per driver
Wiring Options	Single 3 ohm coil; the pair wires to 1.5 ohm parallel or 6 ohm series
Parameter Source	JL Audio 8W7AE-3 published specifications
Material	Langboard Elite MDF
Construction	CNC cut, V-groove and dado joinery
Panel Thickness	0.75 in
Front Baffle	1.5 in double baffle, outer layer machined as a flush recess
Internal Bracing	Full-height 3/4 in divider
Driver Mounting	Threaded inserts pressed on JL's bolt circle, stainless machine screws included
Terminal Cups	One Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC to both driver positions
Acrylic Insert	Gloss black acrylic baffle insert standard; None variant minus $20
Damping	Light polyfill wall lining in both chambers, does not alter acoustic volume
Carpet	Plush black
Shipping Weight	51 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Performance Graphs

Net airspace

0.87

cu ft per chamber

System Qtc

0.80

sealed

Half power

41.3

Hz · F3

Xmax at

356

W RMS · no filter

With 25 Hz subsonic

431

W RMS · +21%

Amplifier

500

W RMS recommended

This enclosure holds 0.87 cu ft net per chamber. In it the JL Audio 8W7AE-3 runs a system Qtc of 0.80 with half power at 41.3 Hz, and the cone reaches its 19.0 mm travel limit at 356 W, below the driver’s 500 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 431 W — +75 W, or 21 percent more power for the same 19.0 mm of travel.

01Is it a sealed driver?

Efficiency bandwidth product places the motor before anything else is decided.

EBP = Fs ÷ Qes = 53.8

single 3 ohm · EBP 53.8

At 53.8 the 8W7AE-3 sits in the transition band, not the sealed band. That is not a mismatch: a transition motor works in either alignment, and sealed buys a smaller box and a gentler roll-off at the cost of some low-end output. Stage 02 shows what this airspace actually does with it.

02What the box does to it

0.87 cu ft against a 17.4 L Vas.

α = Vas ÷ Vb = 0.70 · Fc = Fs√(α+1) = 46 Hz · Qtc = 0.80

single 3 ohm · Qtc 0.80, Fc 46 Hz, F3 41.3 Hz

The box lifts resonance from 35.2 Hz free-air to 46 Hz and half power lands at 41.3 Hz, anechoic, before any cabin gain. Figures are JL Audio’s published 8W7AE-3 parameters, and they hold together: Qes and Qms reproduce the printed Qts, and the moving mass and compliance reproduce the 35.2 Hz resonance and 17.4 liter Vas. Each chamber of this dual holds 0.875 cubic feet, JL’s own recommended sealed volume, so per driver it is the single wedge twice over.

03The watts that reach Xmax (in this enclosure)

Travel scales with the square root of power, so there is one wattage that puts the cone exactly on 19.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

P_Xmax = 356 W unfiltered → 431 W with a 25 Hz subsonic

single 3 ohm · 356 W, no filtersingle 3 ohm · 431 W with subsonic at 25 Hz, 24 dB/octXmax 19.0 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 19.0 mm. Unfiltered that is 356 W, reached first at 21 Hz. It sits under the 500 W the driver can take thermally, so the enclosure sets the ceiling, not the voice coil. The dashed traces are the same driver behind a subsonic filter at 25 Hz, 24 dB/oct: stopping the cone wasting travel below the passband lets it take 431 W before hitting the same 19.0 mm. That is 21 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	35.20	Hz	free-air resonance
Qts	0.612		single 3 ohm
Vas	17.40	L	equivalent compliance
Sd	245.0	cm²	effective piston area
Xmax	19	mm	one-way linear travel
Pe	500	W	continuous RMS
SPL	82.5	dB	1 W / 1 m, derived from T/S

Driver parameters as published by JL Audio 8W7AE-3 published specifications. Curves computed against this enclosure’s actual net airspace.

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, its 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.