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Proline X PO 12T-S W XR12 sealed wedge enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Performance Optimized · Datasheet

Performance Optimized Wedge Wide Sealed Triple 12" Enclosure American Bass XR 12 · Triple 12" Sealed enclosure

Net volume
1.884 cu ft per driver, 5.65 cu ft total, after both dividers and an estimated 0.138 cu ft displacement per driver
Max mounting depth
7.76 in required; 8.75 in clearance above the motor against the raked rear panel
External dimensions
44 in W × 17 in at the seat face H × 23.00 in at the base D
Front baffle
1.5 in double baffle, outer layer machined as a flush recess
Buy at Audio IntensityFactory-direct, ships from Tullahoma
American Bass XR 12Buy at Audio Intensity
  • Best For: Triple American Bass XR 12 SUV Cargo-Floor Builds
  • Net Volume: 1.884 cu ft per Driver (5.65 cu ft Net Total)
  • Driver Match: Three American Bass XR 12 (Dual 2 Ohm / Dual 4 Ohm), matched
  • Construction: 3 Chambers | 44" Wide Wedge | V-Groove/Dado | Double 1.5" Baffle | 3 Terminal Cups

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge Wide
Compatible DriverAmerican Bass XR 12, quantity 3, matched. Direct fit
ConfigurationTriple 12 inch sealed wedge, 3 chambers, 1 driver per chamber
Mounting PositionSUV cargo floor, raked face against the rear seat back
Firing DirectionRearward toward the liftgate. Not a down fire design
External Width44 in
External Height17 in at the seat face
External Depth23.00 in at the base, tapering to 16.81 in at the top
Internal Volume, Gross6.29 cu ft total
Internal Volume, Net Acoustic1.884 cu ft per driver, 5.65 cu ft total, after both dividers and an estimated 0.138 cu ft displacement per driver
Driver Mounting Depth7.76 in required; 8.75 in clearance above the motor against the raked rear panel
Alignment Per DriverXR 12 D2 Qtc 0.749, fc 39.6 Hz, F3 37.5 Hz; XR 12 D4 Qtc 0.855, fc 41.5 Hz, F3 35.6 Hz anechoic
Woofer Openings3 at 11.610 in
Woofer LayoutOne row across the face
Frame Outer Diameter13.098 in
Fs / Qts / Qes / Qms34.2 Hz / 0.647 / 0.710 / 7.320
Vas / Sd / Xmax18.2 L / 536 cm2 / 17 mm
Driver Power Handling1200 W RMS per driver, 3600 W RMS for the set of 3 (thermal rating)
Recommended Amplifier840-1200 W RMS per driver, 2,520-3,600 W RMS for the full set
Parameter SourceAmerican Bass published specifications
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in double baffle, outer layer machined as a flush recess
Internal BracingTwo full-height 3/4 in dividers
Driver MountingThreaded inserts, stainless machine screws included
Terminal CupsThree Proline X ABS and carbon fiber composite, on the rear panel, one per chamber, pre wired 12 gauge OFC
Acrylic InsertGloss black acrylic baffle insert standard
DampingLight polyfill wall lining in every chamber, does not alter acoustic volume
CarpetPlush black
Shipping Weight97 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
1.884
cu ft per driver
System Qtc
0.75–0.85
sealed
Half power
35.6–37.5
Hz · F3
Xmax at
902
W RMS per driver · no filter
With 25 Hz subsonic
1258
W RMS per driver · +40%
Amplifier, per driver
840–1200
W RMS recommended
This enclosure holds 1.884 cu ft net per driver. In it the American Bass XR 12 D2 runs a system Qtc of 0.75–0.85 with half power at 35.6–37.5 Hz, and the cone reaches its 17.0 mm travel limit at 902 W per driver, below the driver’s 1200 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 1258 W per driver — +356 W, or 40 percent more power for the same 17.0 mm of travel.

00Sizing the amplifier

Every wattage on this panel is per driver. This cabinet holds three, so the amplifier feeds all three at once.

Per driver 840–1200 W RMS  ×  3 drivers  =  full set 2,520–3,600 W RMS
Look for a mono amplifier rated 2,520–3,600 W RMS at the load your coil version wires to. The top is the driver’s 1200 W thermal rating; with the 25 Hz subsonic set the cone still has travel to spare there, reaching Xmax only at 1258 W. The top of the range needs the 25 Hz subsonic filter set; without it, keep each driver under 902 W, where the cone reaches Xmax unfiltered. Below the bottom of the range it will play, just with less headroom; above the top you are buying power the drivers cannot use.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 44.8–48.2
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 Dual 2 Ohm 48.2 Dual 4 Ohm 44.8
Dual 2 Ohm · EBP 48.2Dual 4 Ohm · EBP 44.8
EBP under 50 means a motor that wants a sealed load. The XR 12 D2 sits at 44.8–48.2, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

1.884 cu ft against a 18.2 L Vas.

α = Vas ÷ Vb = 0.34  ·  Fc = Fs√(α+1) = 40–42 Hz  ·  Qtc = 0.75–0.85
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
Dual 2 Ohm · Qtc 0.75, Fc 40 Hz, F3 37.5 HzDual 4 Ohm · Qtc 0.85, Fc 42 Hz, F3 35.6 Hz
The box lifts resonance from 34.2–36.3 Hz free-air to 40–42 Hz and half power lands at 35.6–37.5 Hz, anechoic, before any cabin gain. Figures are American Bass’s published parameters; Qes and Qms reproduce the printed Qts. This cabinet holds three drivers in three separate sealed chambers of 1.884 cubic feet each, the volume plotted here.

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

PXmax = 902–1022 W per driver unfiltered  →  1258–1305 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 4 8 12 16 20 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 17.0 mm 902 W reaches Xmax here
Dual 2 Ohm · 902 W, no filterDual 4 Ohm · 1022 W, no filterDual 2 Ohm · 1305 W with subsonic at 25 Hz, 24 dB/octDual 4 Ohm · 1258 W with subsonic at 25 Hz, 24 dB/octXmax 17.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 17.0 mm. Unfiltered that is 902 W per driver, reached first at 20 Hz. It sits under the 1200 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 1258 W per driver before hitting the same 17.0 mm. That is 40 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs34.20 / 36.30Hzfree-air resonance
Qts0.647 / 0.747Dual 2 Ohm / Dual 4 Ohm
Vas18.18 / 16.53Lequivalent compliance
Sd535.5cm²effective piston area
Xmax17mmone-way linear travel
Pe1200Wcontinuous RMS
SPL82.0dB1 W / 1 m, derived from T/S

Driver parameters as published by American Bass XR 12 D2 / XR 12 D4 published specifications. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Start with the size. 1.884 cubic feet per driver puts the XR 12 at Qtc 0.749, resonance 39.6 Hz, half power 37.5 Hz anechoic. Maximally flat on these figures would need 3.31 cubic feet per driver. The wide platform stops at 23 inches deep, so this box lands a little above flat: a small lift near resonance and firm midbass. One box serves every coil version: the Dual 2 Ohm at Qtc 0.749, the Dual 4 Ohm at Qtc 0.855.

Measure the base depth, not the top. This cabinet is 23.00 in deep where it meets the floor, 16.81 at the top, 44 wide and 17 tall. In an SUV the 44 has to clear between the rear wheel wells at floor height, the base depth is measured from the seat back with the seat upright and latched, and the 17 has to clear the cargo cover.

All three terminal cups are on the rear panel, and the rear panel is the face that goes against the seat back. Wire all three before the box goes in, with enough slack to slide it into place; once the raked face is against the seat you cannot reach them.

Each driver has its own chamber. The outer two are set 0.49 in toward the ends of their chambers so the 13.098 in frames clear each other; that is deliberate, not an off-center cut.

Impedance. XR 12 D2: wire for 3 ohms (coils in parallel, the three in series), the load most monoblocks are built to deliver full power into; 1.33 ohms is the other clean option (coils in series, the three cups in parallel). XR 12 D4: wire for 2.67 ohms (coils in series, the three cups in parallel), the load most monoblocks are built to deliver full power into; 6 ohms is the other clean option (coils in parallel, the three in series). Work the load out before you buy the amplifier, not after.

Power. Size the amplifier for the set, not one driver: 840 to 1200 W RMS per driver is 2,520 to 3,600 W RMS across all 3. Set the 25 Hz subsonic to use the top of that range; without it keep each driver under 902 W. At 3,600 W the charging system is part of the install: alternator output, the big three, and a battery that holds voltage under load.

American Bass's Qes and Qms reproduce the printed Qts within 3 percent, so the alignment rests on a self-consistent set. American Bass do not publish driver displacement; we deduct an estimated 0.138 per driver, so true net can sit a few hundredths either way.

Polyfill is in as a wall lining in every chamber. Do not add more: it makes the box act larger and walks Qtc off 0.75.

Before you order

Questions

Does this fit the American Bass XR 12, and its coil versions?

Yes. Each opening is cut to 11.610 in for the 13.098 in frame, and the 7.76 in deep motor clears the raked rear panel with 8.75 in to spare. Both coil versions share the frame, cutout and mounting depth; the alignment table lists each.

Run three matched drivers, same model and same coil, so every chamber sees the alignment on this page.

Why 1.884 cubic feet per driver, and what alignment does it target?

On American Bass's published Fs 34.2 Hz, Qts 0.647 and Vas 18.2 liters, 1.884 cubic feet per driver gives Qtc 0.749, system resonance 39.6 Hz and half power 37.5 Hz.

Maximally flat on these figures would need 3.31 cubic feet per driver. The wide platform stops at 23 inches deep, so this box lands a little above flat: a small lift near resonance and firm midbass.

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

American Bass rates the XR 12 at 1200 watts RMS per driver. Recommended amplifier: 840 to 1200 W RMS per driver, 2,520 to 3,600 W RMS for the full set of 3. The top of that range needs the 25 Hz subsonic; without it keep each driver under 902 W.

Each XR 12 D2 has two 2 ohm voice coils, 4 ohms in series or 1 ohm in parallel. With each driver's coils in series and the three cups in parallel, the three present 1.33 ohms to a mono amplifier. With each driver's coils in parallel and the three in series, they present 3 ohms. Three drivers do not reach the round loads a pair does, so check the result against your amplifier's minimum stable impedance before powering up. Each XR 12 D4 has two 4 ohm voice coils, 8 ohms in series or 2 ohms in parallel. With each driver's coils in series and the three cups in parallel, the three present 2.67 ohms to a mono amplifier. With each driver's coils in parallel and the three in series, they present 6 ohms. Three drivers do not reach the round loads a pair does, so check the result against your amplifier's minimum stable impedance before powering up.

Will it fit my SUV?

It is 44 inches wide, 17 tall and 23.00 deep at the base, tapering to 16.81 at the top. Measure between the rear wheel wells, the floor depth with the seat upright, and the height under your cargo cover.

The raked face goes against the seat back and the woofers fire toward the liftgate.

Why are all three terminal cups on the back?

Each driver has its own sealed chamber, and the center chamber has no side wall to take a cup. Putting all three on the rear panel gives a matching set, one cup per chamber.

Wire them at the amplifier end; there is no cross-chamber wiring inside the cabinet.

What is the expected low-frequency extension?

Anechoic F3 is 37.5 Hz per driver with system resonance at 39.6 Hz.

Those figures exclude cabin gain. An SUV cabin adds real output below about 50 Hz, so in-vehicle response runs deeper than the numbers above.

Do I need to add polyfill or damping?

No. Polyfill is already installed as a light wall lining in every chamber, and the quantity is chosen so it does not change the acoustic volume.

Do not add more. Packing a sealed box makes it behave as though it were larger, which moves the alignment away from 1.884 cubic feet per driver.

Are the drivers included?

No. This is an enclosure only. You receive the cabinet finished in plush black carpet with the gloss black acrylic baffle insert, three pre-wired terminal cups on the rear panel, the polyfill lining in place, threaded inserts and stainless machine screws.

Bring three matched American Bass XR 12 drivers. The cabinet is cut direct fit to them, not a general purpose 12 inch box.

Same series, same size

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