A Proline Performance Optimized Series 3XL subwoofer enclosure shown on a dark blue background with dimension callouts of 22.2 inches by 18 inches and product specifications listed on the left.A performance-optimized car subwoofer enclosure shown on a dark blue gradient background with measurement labels and product details. The enclosure is dark gray/black with a circular speaker grille.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed 15" Enclosure | PowerBass 3XL-1510D Single 15" Sealed enclosure

Net volume
2.25 cu ft
Max mounting depth
11.2000 in required
Cutout
14.0600 in
External dimensions
23.22 in W × 18 in at the seat face H × 18.61 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio Intensity
  • Best For: PowerBass 3XL-1510D Trunk-Fit Builds
  • Net Volume: 2.25 cu ft (2.44 cu ft Gross)
  • Alignment: Qtc 0.680, fc 44.2 Hz, F3 46.1 Hz
  • Driver Match: 3XL-1510D
  • Impedance: dual 1 ohm coils, wire in series
  • Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Inserts

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge
Compatible DriverPowerBass 3XL-1510D, quantity 1. Direct fit
ConfigurationSingle 15 inch, single 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 Width23.22 in
External Height18 in at the seat face
External Depth18.61 in at the base, tapering to 12.06 in at the top
Internal Volume, Gross2.44 cu ft
Internal Volume, Net Acoustic2.25 cu ft
AlignmentQtc 0.680, fc 44.2 Hz, F3 46.1 Hz anechoic
Driver Cutout14.0600 in
Driver Mounting Depth11.2000 in required
Power Handling1500 watts RMS
ImpedanceDual 1 ohm voice coils
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in, double baffle
Internal BracingWindowed C brace
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
Weight43.3 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Performance in this enclosure

Net airspace
2.25
cu ft per chamber
System Qtc
0.68
sealed
Half power
46.1
Hz · F3
Xmax at
2005
W RMS · no filter
With 25 Hz subsonic
2887
W RMS · +44%
Amplifier
1500
W RMS recommended
This enclosure holds 2.25 cu ft net per chamber. In it the PowerBass 3XL-1510D runs a system Qtc of 0.68 with half power at 46.1 Hz, and the cone reaches its 24.0 mm travel limit at 2005 W, above the driver’s 1500 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 2887 W — +883 W, or 44 percent more power for the same 24.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 59.3
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D1 59.3
D1 · EBP 59.3
At 59.3 the 3XL-1510D 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

2.25 cu ft against a 80.4 L Vas.

α = Vas ÷ Vb = 1.26  ·  Fc = Fs√(α+1) = 44 Hz  ·  Qtc = 0.68
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D1 · Qtc 0.68, Fc 44 Hz, F3 46.1 Hz
The box lifts resonance from 29.4 Hz free-air to 44 Hz and half power lands at 46.1 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 24.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 2005 W unfiltered  →  2887 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 8 16 24 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 24.0 mm 2005 W reaches Xmax here
D1 · 2005 W, no filterD1 · 2887 W with subsonic at 25 Hz, 24 dB/octXmax 24.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 24.0 mm. Unfiltered that is 2005 W, reached first at 20 Hz. It sits above the 1500 W the driver can take thermally, so the voice coil gives up before the suspension does. 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 2887 W before hitting the same 24.0 mm. That is 44 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs29.40Hzfree-air resonance
Qts0.452D1
Vas80.38Lequivalent compliance
Sd881.4cm²effective piston area
Xmax24mmone-way linear travel
Pe1500Wcontinuous RMS
SPL88.0dB1 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. 2.25 cubic feet net is PowerBass's own published sealed airspace for the 3XL-1510D and we cut to it exactly, which lands at Qtc 0.680. PowerBass publishes 0.670 at the same volume, so there is no argument to have about the alignment.

F3 lands at 46.1 Hz anechoic, before any cabin gain.

On impedance: Dual 1 ohm coils give 2 ohms in series or 0.5 ohms in parallel. Almost nothing on the market is stable into 0.5 ohms, so series 2 ohm wiring is the default answer on this driver.

Measure the base depth. This cabinet is 18.61 inches deep at the trunk floor, 12.06 at the top, and 23.22 wide. The floor dimension is what decides whether it goes in.

Questions

Will this enclosure fit the 3XL-1510D exactly?

Yes. The baffle is CNC cut to 14.0600 in for the 3XL-1510D's published cutout and the cabinet clears its 11.2000 in mounting depth. Threaded inserts are pressed in at every mounting location so the driver bolts to metal, not to MDF.

Why 2.25 cubic feet net?

It is PowerBass's published sealed recommendation for the 3XL-1510D. In it the driver runs Qtc 0.680 with fc at 44.2 Hz and F3 at 46.1 Hz. PowerBass publishes Qtc 0.670 and F3 44 Hz for the same airspace, so our numbers and theirs agree.

What amplifier power should I run, and what impedance?

The 3XL-1510D is rated 1500 watts RMS, so 1500 across the driver. Dual 1 ohm coils give 2 ohms in series or 0.5 ohms in parallel. Almost nothing on the market is stable into 0.5 ohms, so series 2 ohm wiring is the default answer on this driver. Aim for roughly 1050 to 1500 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 24 mm of one-way travel and 1500 watts on tap that matters.

What is the expected low-frequency extension?

F3 lands at 46.1 Hz anechoic, before any cabin gain. Qtc is 0.680, 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.

Is the driver included?

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

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