Proline X PO 12T-S W SPC12 sealed wedge enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Performance Optimized · Datasheet

AudioControl Space SPC-12 Triple Box: Sealed 12" Shallow Wedge Wide Enclosure Triple 12" Sealed enclosure

Net volume: 1.250 cu ft per driver, 3.75 cu ft total, after both dividers and AudioControl's published 0.062 cu ft displacement per driver
Max mounting depth: 3.94 in required; 6.63 in clearance above the motor against the raked rear panel
External dimensions: 44 in W × 17 in at the seat face H × 17.06 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

AudioControl Space SPC-12Buy at Audio Intensity

Best For: Triple AudioControl Space SPC-12 SUV Cargo-Floor Builds
Net Volume: 1.250 cu ft per Driver (3.75 cu ft Net Total)
Driver Match: Three AudioControl Space SPC-12 (Single 2 Ohm / 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	AudioControl Space SPC-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	17.06 in at the base, tapering to 10.88 in at the top
Internal Volume, Gross	4.08 cu ft total
Internal Volume, Net Acoustic	1.250 cu ft per driver, 3.75 cu ft total, after both dividers and AudioControl's published 0.062 cu ft displacement per driver
Driver Mounting Depth	3.94 in required; 6.63 in clearance above the motor against the raked rear panel
Alignment Per Driver	SPC-12S2 Qtc 0.743, fc 49.1 Hz, F3 46.8 Hz; SPC-12S4 Qtc 0.850, fc 52.3 Hz, F3 44.9 Hz anechoic
Woofer Openings	3 at 11.100 in
Woofer Layout	One row across the face
Frame Outer Diameter	12.37 in
Fs / Qts / Qes / Qms	27.8 Hz / 0.422 / 0.470 / 4.076
Vas / Sd / Xmax	74.6 L / 511 cm2 / 9 mm
Driver Power Handling	400 W RMS per driver, 1200 W RMS for the set of 3 (thermal rating)
Recommended Amplifier	130-190 W RMS per driver, 390-570 W RMS for the full set
Parameter Source	AudioControl 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	81 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace

1.250

cu ft per driver

System Qtc

0.74–0.85

sealed

Half power

44.9–46.8

Hz · F3

Xmax at

160

W RMS per driver · no filter

With 25 Hz subsonic

199

W RMS per driver · +24%

Amplifier, per driver

130–190

W RMS recommended

This enclosure holds 1.250 cu ft net per driver. In it the AudioControl SPC-12S2 runs a system Qtc of 0.74–0.85 with half power at 44.9–46.8 Hz, and the cone reaches its 9.0 mm travel limit at 160 W per driver, 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 199 W per driver — +39 W, or 24 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 130–190 W RMS × 3 drivers = full set 390–570 W RMS

Look for a mono amplifier rated 390–570 W RMS at the load your coil version wires to. Travel sets the top here, not heat: past 199 W per driver the cone runs beyond Xmax even with the subsonic set, under the driver’s 400 W thermal rating. The top of the range needs the 25 Hz subsonic filter set; without it, keep each driver under 160 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 = 53.3–59.2

Single 2 Ohm · EBP 59.2Single 4 Ohm · EBP 53.3

At 53.3–59.2 the SPC-12S2 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

1.250 cu ft against a 74.6 L Vas.

α = Vas ÷ Vb = 2.11 · Fc = Fs√(α+1) = 49–52 Hz · Qtc = 0.74–0.85

Single 2 Ohm · Qtc 0.74, Fc 49 Hz, F3 46.8 HzSingle 4 Ohm · Qtc 0.85, Fc 52 Hz, F3 44.9 Hz

The box lifts resonance from 27.8–30.7 Hz free-air to 49–52 Hz and half power lands at 44.9–46.8 Hz, anechoic, before any cabin gain. Figures are AudioControl’s published parameters; Qes and Qms reproduce the printed Qts. This cabinet holds three drivers in three separate sealed chambers of 1.250 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 = 160–190 W per driver unfiltered → 199–206 W with a 25 Hz subsonic

Single 2 Ohm · 160 W, no filterSingle 4 Ohm · 190 W, no filterSingle 2 Ohm · 199 W with subsonic at 25 Hz, 24 dB/octSingle 4 Ohm · 206 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 160 W per driver, 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 199 W per driver before hitting the same 9.0 mm. That is 24 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	27.84 / 30.71	Hz	free-air resonance
Qts	0.422 / 0.500		Single 2 Ohm / Single 4 Ohm
Vas	74.56 / 67.15	L	equivalent compliance
Sd	511.0	cm²	effective piston area
Xmax	9	mm	one-way linear travel
Pe	400	W	continuous RMS
SPL	87.2	dB	1 W / 1 m, derived from T/S

Driver parameters as published by AudioControl SPC-12S2 / SPC-12S4 published specifications. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Start with the size. 1.250 cubic feet per driver puts the Space SPC-12 at Qtc 0.743, resonance 49.1 Hz, half power 46.8 Hz anechoic. That is AudioControl's number, not ours: the cabinet is built to the maker's recommended sealed size. Butterworth on these figures wants 1.45, which on this platform means 18.8 in deep at the base. It is effectively flat, under 0.1 dB of lift near resonance. One box serves every coil version: the Single 2 Ohm at Qtc 0.743, the Single 4 Ohm at Qtc 0.850.

Measure the base depth, not the top. This cabinet is 17.06 in deep where it meets the floor, 10.88 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. SPC-12S2: wire for 6 ohms (the three in series), the load most monoblocks are built to deliver full power into; 0.67 ohms is the other clean option (the three in parallel). SPC-12S4: 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: 130 to 190 W RMS per driver is 390 to 570 W RMS across all 3. On this driver travel sets the top, not heat: Xmax arrives at 199 W per driver with a 25 Hz subsonic, under the 400 W rating. Set the 25 Hz subsonic to use the top of that range; without it keep each driver under 160 W.

AudioControl's Qes and Qms reproduce the printed Qts within 3 percent, so the alignment rests on a self-consistent set.

Polyfill is in as a wall lining in every chamber. Do not add more: it makes the box act larger and walks Qtc off 0.74.

Before you order

Questions

Does this fit the AudioControl Space SPC-12, and its coil versions?

Yes. Each opening is cut to 11.100 in for the 12.37 in frame, and the 3.94 in deep motor clears the raked rear panel with 6.63 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 1.250 cubic feet per driver, and what alignment does it target?

On AudioControl's published Fs 27.8 Hz, Qts 0.422 and Vas 74.6 liters, 1.250 cubic feet per driver gives Qtc 0.743, system resonance 49.1 Hz and half power 46.8 Hz.

The cabinet is sized to the maker's recommended sealed size, 1.25 cubic feet per driver, to keep it realistic for a cargo floor. Maximally flat would need 1.45 cubic feet per driver; this size trades a little low end for a compact box and effectively flat, under 0.1 dB of lift near resonance.

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

AudioControl rates the Space SPC-12 at 400 watts RMS per driver. Recommended amplifier: 130 to 190 W RMS per driver, 390 to 570 W RMS for the full set of 3. Travel, not heat, sets the top: the cone reaches Xmax at 199 W per driver with a 25 Hz subsonic set, under the 400 W rating. The top of that range needs the 25 Hz subsonic; without it keep each driver under 160 W.

Each SPC-12S2 has a single 2 ohm voice coil. The three in parallel present 0.67 ohms; in series, 6 ohms. Check the result against your amplifier's minimum stable impedance before powering up. Each SPC-12S4 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 17.06 deep at the base, tapering to 10.88 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 46.8 Hz per driver with system resonance at 49.1 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 1.250 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 AudioControl Space SPC-12 drivers. The cabinet is cut direct fit to them, not a general purpose 12 inch box.

Same series, same size