A product graphic for a Proline Performance Optimized Series 2XLD dual woofer speaker enclosure. The black acrylic enclosure features two circular openings with beige acoustic foam inserts, shown against a dark blue gradient background with technical specifications and dimensions.Close-up of a Proline X Performance optimized woofer enclosure showing a circular driver opening with a beige wood insert, black acrylic surround, visible mounting bolts, and wiring. Text on the left reads 'PROLINE Performance Optimized Series' and 'Part # PO 10D-S W 2XLD'.A performance-optimized subwoofer enclosure shown on a dark blue gradient background with measurement callouts and product details. The enclosure is dark gray/black with a circular speaker port in the center.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed Dual 10" Enclosure | PowerBass 2XL-1040D Dual 10" Sealed enclosure

Net volume
1.50 cu ft total, 0.75 per driver
Max mounting depth
4.7500 in required
Cutout
9.0000 in
External dimensions
32.00 in W × 15 in at the seat face H × 13.15 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio Intensity
  • Best For: Dual PowerBass 2XL-1040D Trunk-Fit Builds
  • Net Volume: 0.75 cu ft per driver (0.85 cu ft Gross)
  • Alignment: Qtc 0.630, fc 45.1 Hz, F3 51.2 Hz
  • Driver Match: 2XL-1040D
  • Impedance: dual 4 ohm coils
  • Construction: Dual Chamber | Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Inserts

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge
Compatible DriverPowerBass 2XL-1040D, quantity 2. Direct fit
ConfigurationDual 10 inch, dual chamber sealed wedge
Mounting PositionTrunk or cargo area, tall face against the rear seat back
Firing DirectionRearward into the trunk. Not a down fire design, no feet included
External Width32.00 in
External Height15 in at the seat face
External Depth13.15 in at the base, tapering to 7.69 in at the top
Internal Volume, Gross1.71 cu ft total, 0.85 per chamber
Internal Volume, Net Acoustic1.50 cu ft total, 0.75 per driver
AlignmentQtc 0.630, fc 45.1 Hz, F3 51.2 Hz anechoic
Driver Cutout9.0000 in
Driver Mounting Depth4.7500 in required
Power Handling800 watts RMS total across the pair
ImpedanceDual 4 ohm voice coils
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in, double baffle
Internal BracingFull chamber divider
Driver MountingThreaded inserts at every mounting location, stainless machine screws included
Terminal CupsOne Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC
DampingLight polyfill wall lining, does not alter acoustic volume
CarpetPlush black
Weight45.2 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Performance in this enclosure

Net airspace
0.75
cu ft per chamber
System Qtc
0.63
sealed
Half power
51.2
Hz · F3
Xmax at
234
W RMS · no filter
With 25 Hz subsonic
354
W RMS · +51%
Amplifier
400
W RMS recommended
This enclosure holds 0.75 cu ft net per chamber. In it the PowerBass 2XL-1040D runs a system Qtc of 0.63 with half power at 51.2 Hz, and the cone reaches its 11.5 mm travel limit at 234 W, below the driver’s 400 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 354 W — +120 W, or 51 percent more power for the same 11.5 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 66.8
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D4 66.8
D4 · EBP 66.8
At 66.8 the 2XL-1040D 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

0.75 cu ft against a 25.5 L Vas.

α = Vas ÷ Vb = 1.20  ·  Fc = Fs√(α+1) = 45 Hz  ·  Qtc = 0.63
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D4 · Qtc 0.63, Fc 45 Hz, F3 51.2 Hz
The box lifts resonance from 30.4 Hz free-air to 45 Hz and half power lands at 51.2 Hz, anechoic, before any cabin gain.

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 11.5 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 234 W unfiltered  →  354 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 4 8 12 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 11.5 mm 234 W reaches Xmax here
D4 · 234 W, no filterD4 · 354 W with subsonic at 25 Hz, 24 dB/octXmax 11.5 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 11.5 mm. Unfiltered that is 234 W, reached first at 20 Hz. It sits under the 400 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 354 W before hitting the same 11.5 mm. That is 51 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs30.40Hzfree-air resonance
Qts0.425D4
Vas25.48Lequivalent compliance
Sd363.1cm²effective piston area
Xmax11.5mmone-way linear travel
Pe400Wcontinuous RMS
SPL83.8dB1 W / 1 m, derived from T/S

Driver parameters as published by powerbassusa.com. Curves computed against this enclosure’s actual net airspace.

Installer's take

This one is straightforward. 0.75 cubic feet net is PowerBass's own published sealed airspace for the 2XL-1040D and we cut to it exactly, which lands at Qtc 0.630. PowerBass publishes 0.621 at the same volume, so there is no argument to have about the alignment.

F3 lands at 51.2 Hz anechoic, before any cabin gain.

On impedance: Dual 4 ohm coils on each driver. Across the pair the sensible targets are 1 ohm or 4 ohms. One ohm needs an amplifier rated for it; check before you wire.

Measure the base depth. This cabinet is 13.15 inches deep at the trunk floor, 7.69 at the top, and 32.00 wide. The floor dimension is what decides whether it goes in.

Questions

Will this enclosure fit the 2XL-1040D exactly?

Yes. The baffle is CNC cut to 9.0000 in for the 2XL-1040D's published cutout and the cabinet clears its 4.7500 in mounting depth. Threaded inserts are pressed in at every mounting location so the driver bolts to metal, not to MDF.

Why 0.75 cubic feet net per driver?

It is PowerBass's published sealed recommendation for the 2XL-1040D. In it the driver runs Qtc 0.630 with fc at 45.1 Hz and F3 at 51.2 Hz. PowerBass publishes Qtc 0.621 and F3 52 Hz for the same airspace, so our numbers and theirs agree.

What amplifier power should I run, and what impedance?

The 2XL-1040D is rated 400 watts RMS each, so 800 across the pair. Dual 4 ohm coils on each driver. Across the pair the sensible targets are 1 ohm or 4 ohms. One ohm needs an amplifier rated for it; check before you wire. Aim for roughly 560 to 800 watts at the final wired impedance.

How does a wedge enclosure improve the sound in a trunk installation?

The angled seat-side face matches the roughly 20 degree lean of a factory rear seat, so the cabinet sits flat against it instead of leaving a wasted triangle. The vertical trunk-lid-side face carries the driver, firing rearward into the trunk cavity, which acts as an acoustic extension into the cabin.

Why is the front baffle double-layered?

The baffle is two bonded 3/4 inch sheets, 1.5 inches through. A subwoofer pushes as hard against its mounting surface as it does against the air, and a single 3/4 inch panel flexes under that load. With 11.5 mm of one-way travel and 800 watts on tap that matters.

What is the expected low-frequency extension?

F3 lands at 51.2 Hz anechoic, before any cabin gain. Qtc is 0.630, so the rolloff is clean rather than peaked. These figures are anechoic and exclude cabin gain, which in most vehicles adds real output below 40 Hz.

Do I need to add polyfill or damping?

No. Polyfill is already installed 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 on this driver moves Qtc down and F3 up.

Are the drivers included?

No. This is an enclosure only. You receive the cabinet finished in plush black carpet, with threaded inserts at both driver positions, stainless machine screws, one side-mounted pre-wired terminal cup and the polyfill lining already installed.

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