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Proline X PO 12T-S W GZTW12F sealed wedge enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Performance Optimized · Datasheet

Performance Optimized Wedge Wide Sealed Triple 12" Enclosure Ground Zero GZTW 12F · Triple 12" Sealed enclosure

Net volume
1.959 cu ft per driver, 5.88 cu ft total, after both dividers and an estimated 0.063 cu ft displacement per driver
Max mounting depth
3.84 in required; 12.67 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
Ground Zero GZTW 12FBuy at Audio Intensity
  • Best For: Triple Ground Zero GZTW 12F SUV Cargo-Floor Builds
  • Net Volume: 1.959 cu ft per Driver (5.88 cu ft Net Total)
  • Driver Match: Three Ground Zero GZTW 12F (SVC), 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 DriverGround Zero GZTW 12F, 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 Acoustic1.959 cu ft per driver, 5.88 cu ft total, after both dividers and an estimated 0.063 cu ft displacement per driver
Driver Mounting Depth3.84 in required; 12.67 in clearance above the motor against the raked rear panel
Alignment Per DriverGZTW 12F SVC Qtc 0.741, fc 49.1 Hz, F3 46.9 Hz anechoic
Woofer Openings3 at 11.180 in
Woofer LayoutOne row across the face
Frame Outer Diameter12.32 in
Fs / Qts / Qes / Qms35.1 Hz / 0.530 / 0.570 / 7.490
Vas / Sd / Xmax53.1 L / 521 cm2 / 16 mm
Driver Power Handling350 W RMS per driver, 1050 W RMS for the set of 3 (thermal rating)
Recommended Amplifier240-350 W RMS per driver, 720-1,050 W RMS for the full set
Parameter SourceGround Zero 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 Weight99 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
1.959
cu ft per driver
System Qtc
0.74
sealed
Half power
46.9
Hz · F3
Xmax at
450
W RMS per driver · no filter
With 25 Hz subsonic
559
W RMS per driver · +24%
Amplifier, per driver
240–350
W RMS recommended
This enclosure holds 1.959 cu ft net per driver. In it the Ground Zero GZTW 12F SVC runs a system Qtc of 0.74 with half power at 46.9 Hz, and the cone reaches its 16.0 mm travel limit at 450 W per driver, above the driver’s 350 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 559 W per driver — +110 W, or 24 percent more power for the same 16.0 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 240–350 W RMS  ×  3 drivers  =  full set 720–1,050 W RMS
Look for a mono amplifier rated 720–1,050 W RMS at the load your coil version wires to. The top is the driver’s 350 W thermal rating; with the 25 Hz subsonic set the cone still has travel to spare there, reaching Xmax only at 559 W. 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 = 61.6
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 SVC 61.6
SVC · EBP 61.6
At 61.6 the GZTW 12F SVC 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

1.959 cu ft against a 53.1 L Vas.

α = Vas ÷ Vb = 0.96  ·  Fc = Fs√(α+1) = 49 Hz  ·  Qtc = 0.74
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
SVC · Qtc 0.74, Fc 49 Hz, F3 46.9 Hz
The box lifts resonance from 35.1 Hz free-air to 49 Hz and half power lands at 46.9 Hz, anechoic, before any cabin gain. Figures are Ground Zero’s published parameters; Qes and Qms reproduce the printed Qts. This cabinet holds three drivers in three separate sealed chambers of 1.959 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 16.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 450 W per driver unfiltered  →  559 W per driver 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 16.0 mm 450 W reaches Xmax here
SVC · 450 W, no filterSVC · 559 W with subsonic at 25 Hz, 24 dB/octXmax 16.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 16.0 mm. Unfiltered that is 450 W per driver, reached first at 20 Hz. It sits above the 350 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 559 W per driver before hitting the same 16.0 mm. That is 24 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs35.10Hzfree-air resonance
Qts0.530SVC
Vas53.10Lequivalent compliance
Sd521.3cm²effective piston area
Xmax16mmone-way linear travel
Pe350Wcontinuous RMS
SPL87.9dB1 W / 1 m, derived from T/S

Driver parameters as published by Ground Zero GZTW 12F SVC published specifications. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Start with the size. 1.959 cubic feet per driver puts the GZTW 12F at Qtc 0.741, resonance 49.1 Hz, half power 46.9 Hz anechoic. Maximally flat on these figures would need 2.41 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.

The load depends on which coil version you run, so settle the coil before you buy the amplifier; the wiring section lists the clean loads for each version.

Power. Size the amplifier for the set, not one driver: 240 to 350 W RMS per driver is 720 to 1,050 W RMS across all 3.

Ground Zero's Qes and Qms reproduce the printed Qts within 3 percent, so the alignment rests on a self-consistent set. Ground Zero do not publish driver displacement; we deduct an estimated 0.063 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 0.74.

Before you order

Questions

Does this fit the Ground Zero GZTW 12F, and its coil versions?

Yes. Each opening is cut to 11.180 in for the 12.32 in frame, and the 3.84 in deep motor clears the raked rear panel with 12.67 in to spare. Coil versions of the Ground Zero GZTW 12F share the frame, cutout and mounting depth, so any of them drops in. The alignment on this page is computed on the GZTW 12F SVC parameters.

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

Why 1.959 cubic feet per driver, and what alignment does it target?

On Ground Zero's published Fs 35.1 Hz, Qts 0.530 and Vas 53.1 liters, 1.959 cubic feet per driver gives Qtc 0.741, system resonance 49.1 Hz and half power 46.9 Hz.

Maximally flat on these figures would need 2.41 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?

Ground Zero rates the GZTW 12F at 350 watts RMS per driver. Recommended amplifier: 240 to 350 W RMS per driver, 720 to 1,050 W RMS for the full set of 3.

Loads depend on the coil version you run. Three dual 4 ohm drivers, coils in series, all three in parallel: 2.67 ohms; coils in parallel, all three in series: 6 ohms. Dual 2 ohm: 1.33 ohms or 3 ohms the same two ways. Single 4 ohm: 1.33 ohms in parallel, 12 ohms in series. Use the lower load only on an amplifier rated stable there.

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 46.9 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 1.959 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 Ground Zero GZTW 12F drivers. The cabinet is cut direct fit to them, not a general purpose 12 inch box.

Same series, same size

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