Proline X PO 12-S W GZHW30 sealed wedge, front baffle with gloss black insert and pre-wired leads, 19.45 by 15 inches.
Proline X PO 12-S W GZHW30 sealed wedge, side profile with recessed terminal cup, 14.70 inch base, 15 inches tall.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed 12" Enclosure Ground Zero GZHW 30 · Single 12" Sealed enclosure

Net volume
1.05 cu ft
Max mounting depth
8.300 in available, 7.800 in required
Cutout
11.180 in
External dimensions
19.45 in W × 15 in at the seat face H × 14.70 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio IntensityFactory-direct, ships from Tullahoma
  • Best For: Ground Zero GZHW 30 Trunk-Fit Builds
  • Net Volume: 1.05 cu ft (1.19 cu ft Gross)
  • Alignment: Qtc 0.707, fc 49.4 Hz, F3 49.4 Hz
  • Driver Match: Ground Zero GZHW 30 (D1 or D2)
  • Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Insert Kit included

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge
Compatible DriverGround Zero GZHW 30, D1 or D2, quantity 1. Direct fit
ConfigurationSingle 12 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 Width19.45 in
External Height15 in at the seat face
External Depth14.70 in at the base, tapering to 9.24 in at the top
Internal Volume, Gross1.19 cu ft
Internal Volume, Net Acoustic1.05 cu ft
AlignmentQtc 0.707, fc 49.4 Hz, F3 49.4 Hz anechoic
Driver Cutout11.180 in
Driver Mounting Depth8.300 in available, 7.800 in required
Frame Outer Diameter12.400 in, as published by Ground Zero
Driver Displacement0.129 cu ft, ESTIMATED, Ground Zero publishes none
Cone Area (estimated)521.3 cm2, ESTIMATED from the published frame and cutout diameters; Ground Zero publish no Sd
Power Handling1500 watts RMS
ImpedanceD1: 2 ohms in series or 0.5 ohm in parallel; D2: 4 ohms in series or 1 ohm in parallel
Xmax22.5 mm one way
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in, double baffle
Internal BracingInternal brace
Driver MountingThreaded insert kit included, NOT pre-installed: Ground Zero publish no mounting hole locations
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
Weight28.8 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

From the shop floor

Installer's take

1.05 cubic feet net, the Butterworth volume for this driver computed from Ground Zero's published Fs, Qts and Vas for the D1 coil. In it the GZHW 30 / GZHW 30XSPL lands at Qtc 0.707, maximally flat, the reference musical alignment, with system resonance at 49.4 Hz. Half power lands at 49.4 Hz anechoic, before any cabin gain.

Ground Zero publishes no cone area and no driver displacement for this woofer, and no bolt circle either. The 521.3 square centimetre cone area behind this alignment is estimated from the frame and cutout diameters they do publish, and the displacement is estimated the same way. Both are marked estimated wherever they appear. Ground Zero publishes Fs, Qts, Qes, Qms and Vas, and those figures are theirs.

Ground Zero publishes no mounting hole locations, so the inserts are not in the baffle when the box arrives. The insert kit is in the box: set them where the woofer's own holes fall, with the drill bit and screws in the kit, and lay the gasket tape before the woofer goes down.

Ground Zero sells the GZHW 30 / GZHW 30XSPL in D1 and D2: the D1 is two 1 ohm coils, 2 ohms in series or 0.5 ohm in parallel; the D2 is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel. Ground Zero prints a separate Thiele-Small column for each coil in the owner's manual. This cabinet is solved on the D1 column. In the same 1.05 cubic feet the D2 column lands at Qtc 0.752 with F3 at 50.2 Hz. The cutout, mounting depth and frame are the same for every coil, so it fits either. A parallel load at or under 1 ohm needs an amplifier rated for it.

Measure the base depth. This cabinet is 14.70 inches deep at the trunk floor, 9.24 at the top, and 19.45 wide.

Before you order

Questions

Will this enclosure fit both coil versions of the GZHW 30 / GZHW 30XSPL?

Yes. Ground Zero sells the GZHW 30 / GZHW 30XSPL in D1 and D2. Ground Zero prints a separate Thiele-Small column for each coil in the owner's manual. This cabinet is solved on the D1 column. In the same 1.05 cubic feet the D2 column lands at Qtc 0.752 with F3 at 50.2 Hz. The cutout, mounting depth and frame are the same for every coil, so it fits either. The cutout is 11.180 in and the mounting depth allowance is 8.300 in.

Why 1.05 cubic feet net?

1.05 cubic feet net, the Butterworth volume for this driver computed from Ground Zero's published Fs, Qts and Vas for the D1 coil. In it the GZHW 30 / GZHW 30XSPL lands at Qtc 0.707, maximally flat, the reference musical alignment, with system resonance at 49.4 Hz. The box is 1.19 cu ft gross before the driver's displacement of 0.129 cu ft, which is an estimate: Ground Zero publish no displacement figure.

What amplifier power should I run, and what impedance?

Ground Zero rate the GZHW 30 / GZHW 30XSPL at 1500 watts RMS. Ground Zero sells the GZHW 30 / GZHW 30XSPL in D1 and D2: the D1 is two 1 ohm coils, 2 ohms in series or 0.5 ohm in parallel; the D2 is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel. Ground Zero prints a separate Thiele-Small column for each coil in the owner's manual. This cabinet is solved on the D1 column. In the same 1.05 cubic feet the D2 column lands at Qtc 0.752 with F3 at 50.2 Hz. The cutout, mounting depth and frame are the same for every coil, so it fits either. A parallel load at or under 1 ohm needs an amplifier rated for it. Aim for roughly 1050 to 1500 watts at the impedance you wire.

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.

Where does the cone area figure come from?

Ground Zero publishes no cone area and no driver displacement for this woofer, and no bolt circle either. The 521.3 square centimetre cone area behind this alignment is estimated from the frame and cutout diameters they do publish, and the displacement is estimated the same way. Both are marked estimated wherever they appear. Ground Zero publishes Fs, Qts, Qes, Qms and Vas, and those figures are theirs.

What is the expected low-frequency extension?

Half power lands at 49.4 Hz anechoic, before any cabin gain. Qtc is 0.707. These figures exclude cabin gain, which in most vehicles adds real output below 40 Hz. Ground Zero publish the GZHW 30 / GZHW 30XSPL's free-air resonance at 39.10 Hz for the D1 coil.

Do I need to add polyfill or damping?

No. Polyfill is already installed as a light wall lining and the quantity is chosen so it does not change the acoustic volume. Do not add more.

Is the driver included, and are the threaded inserts installed?

No driver: this is an enclosure only. You receive the cabinet finished in plush black carpet, one side-mounted pre-wired terminal cup and the polyfill lining installed. Ground Zero publishes no mounting hole locations for this driver, so the threaded inserts are not pressed before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, allen-head screws, an allen key and woofer gasket tape. You set them when the woofer goes in.

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