Proline X PO 12T-S W SL12 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 SL 12 · Triple 12" Sealed enclosure

Net volume: 1.961 cu ft per driver, 5.88 cu ft total, after both dividers and an estimated 0.061 cu ft displacement per driver
Max mounting depth: 4.09 in required; 12.42 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 SL 12Buy at Audio Intensity

Best For: Triple American Bass SL 12 SUV Cargo-Floor Builds
Net Volume: 1.961 cu ft per Driver (5.88 cu ft Net Total)
Driver Match: Three American Bass SL 12 (Single 4 Ohm), matched
Construction: 3 Chambers | 44" Wide Wedge | V-Groove/Dado | Double 1.5" Baffle | 3 Terminal Cups

Spec of record

Technical specifications

Specification	Value
Series	Proline X Performance Optimized Wedge Wide
Compatible Driver	American Bass SL 12, quantity 3, matched. Direct fit
Configuration	Triple 12 inch sealed wedge, 3 chambers, 1 driver per chamber
Mounting Position	SUV cargo floor, raked face against the rear seat back
Firing Direction	Rearward toward the liftgate. Not a down fire design
External Width	44 in
External Height	17 in at the seat face
External Depth	23.00 in at the base, tapering to 16.81 in at the top
Internal Volume, Gross	6.29 cu ft total
Internal Volume, Net Acoustic	1.961 cu ft per driver, 5.88 cu ft total, after both dividers and an estimated 0.061 cu ft displacement per driver
Driver Mounting Depth	4.09 in required; 12.42 in clearance above the motor against the raked rear panel
Alignment Per Driver	SL 12 S4 Qtc 0.788, fc 51.8 Hz, F3 47.0 Hz anechoic
Woofer Openings	3 at 10.670 in
Woofer Layout	One row across the face
Frame Outer Diameter	12.5 in
Fs / Qts / Qes / Qms	34.5 Hz / 0.525 / 0.612 / 3.690
Vas / Sd / Xmax	69.6 L / 531 cm2 / 9 mm
Driver Power Handling	300 W RMS per driver, 900 W RMS for the set of 3 (thermal rating)
Recommended Amplifier	120-170 W RMS per driver, 360-510 W RMS for the full set, at 12 ohms
Parameter Source	American Bass 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	Two full-height 3/4 in dividers
Driver Mounting	Threaded inserts, stainless machine screws included
Terminal Cups	Three Proline X ABS and carbon fiber composite, on the rear panel, one per chamber, pre wired 12 gauge OFC
Acrylic Insert	Gloss black acrylic baffle insert standard
Damping	Light polyfill wall lining in every chamber, does not alter acoustic volume
Carpet	Plush black
Shipping Weight	100 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace

1.961

cu ft per driver

System Qtc

0.79

sealed

Half power

47.0

Hz · F3

Xmax at

152

W RMS per driver · no filter

With 25 Hz subsonic

174

W RMS per driver · +14%

Amplifier, per driver

120–170

W RMS recommended

This enclosure holds 1.961 cu ft net per driver. In it the American Bass SL 12 S4 runs a system Qtc of 0.79 with half power at 47.0 Hz, and the cone reaches its 9.0 mm travel limit at 152 W per driver, below the driver’s 300 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 174 W per driver — +22 W, or 14 percent more power for the same 9.0 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 120–170 W RMS × 3 drivers = full set 360–510 W RMS at 12 ohms

Look for a mono amplifier rated 360–510 W RMS at 12 ohms, the load the set wires to most easily. Travel sets the top here, not heat: past 174 W per driver the cone runs beyond Xmax even with the subsonic set, under the driver’s 300 W thermal rating. The top of the range needs the 25 Hz subsonic filter set; without it, keep each driver under 152 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 = 56.4

Single 4 Ohm · EBP 56.4

At 56.4 the SL 12 S4 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

1.961 cu ft against a 69.6 L Vas.

α = Vas ÷ Vb = 1.25 · Fc = Fs√(α+1) = 52 Hz · Qtc = 0.79

Single 4 Ohm · Qtc 0.79, Fc 52 Hz, F3 47.0 Hz

The box lifts resonance from 34.5 Hz free-air to 52 Hz and half power lands at 47.0 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 1.961 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 9.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

P_Xmax = 152 W per driver unfiltered → 174 W per driver with a 25 Hz subsonic

Single 4 Ohm · 152 W, no filterSingle 4 Ohm · 174 W with subsonic at 25 Hz, 24 dB/octXmax 9.0 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 9.0 mm. Unfiltered that is 152 W per driver, reached first at 23 Hz. It sits under the 300 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 174 W per driver before hitting the same 9.0 mm. That is 14 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	34.50	Hz	free-air resonance
Qts	0.525		Single 4 Ohm
Vas	69.60	L	equivalent compliance
Sd	531.0	cm²	effective piston area
Xmax	9	mm	one-way linear travel
Pe	300	W	continuous RMS
SPL	88.5	dB	1 W / 1 m, derived from T/S

Driver parameters as published by American Bass SL 12 S4 published specifications. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Start with the size. 1.961 cubic feet per driver puts the SL 12 at Qtc 0.788, resonance 51.8 Hz, half power 47.0 Hz anechoic. Maximally flat on these figures would need 3.02 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.

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.

Impedance. SL 12 S4: wire for 12 ohms (the three in series), the load most monoblocks are built to deliver full power into; 1.33 ohms is the other clean option (the three in parallel). Work the load out before you buy the amplifier, not after.

Power. Size the amplifier for the set, not one driver: 120 to 170 W RMS per driver is 360 to 510 W RMS across all 3 at 12 ohms. On this driver travel sets the top, not heat: Xmax arrives at 174 W per driver with a 25 Hz subsonic, under the 300 W rating. Set the 25 Hz subsonic to use the top of that range; without it keep each driver under 152 W.

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 0.061 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 0.79.

Before you order

Questions

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

Yes. Each opening is cut to 10.670 in for the 12.5 in frame, and the 4.09 in deep motor clears the raked rear panel with 12.42 in to spare. Coil versions of the American Bass SL 12 share the frame, cutout and mounting depth, so any of them drops in. The alignment on this page is computed on the SL 12 S4 parameters.

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

Why 1.961 cubic feet per driver, and what alignment does it target?

On American Bass's published Fs 34.5 Hz, Qts 0.525 and Vas 69.6 liters, 1.961 cubic feet per driver gives Qtc 0.788, system resonance 51.8 Hz and half power 47.0 Hz.

Maximally flat on these figures would need 3.02 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 SL 12 at 300 watts RMS per driver. Recommended amplifier: 120 to 170 W RMS per driver, 360 to 510 W RMS for the full set of 3. Travel, not heat, sets the top: the cone reaches Xmax at 174 W per driver with a 25 Hz subsonic set, under the 300 W rating. The top of that range needs the 25 Hz subsonic; without it keep each driver under 152 W.

Each SL 12 S4 has a single 4 ohm voice coil. The three in parallel present 1.33 ohms; in series, 12 ohms. 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 47.0 Hz per driver with system resonance at 51.8 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 1.961 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 SL 12 drivers. The cabinet is cut direct fit to them, not a general purpose 12 inch box.

Same series, same size