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Proline X PO 10D-P W GZRW250F dual ported wedge, front baffle with gloss black insert, 32 by 15 inches.
Proline X PO 10D-P W GZRW250F dual ported wedge, side profile with the port mouth, 15.0 inch base, 15 inches tall.

Performance Optimized · Datasheet

Performance Optimized Wedge Ported Dual 10" Enclosure Ground Zero GZRW 250-D2 FLAT · Dual 10" Ported enclosure

Net volume
1.63 cu ft, one shared chamber (0.82 per driver)
Tuning
32.5 Hz
External dimensions
32.00" W x 15" H
Front baffle
1.5 in double baffle
Buy at Audio IntensityFactory-direct, ships from Tullahoma
Ground Zero GZRW 250-D2 FLATBuy at Audio Intensity
  • Alignment: 1.63 cu ft net shared, vented at 32.5 Hz, F3 34.1 Hz
  • Drivers: Pair of Ground Zero GZRW 250-D2 FLAT, 400 W RMS each, dual 2 ohm
  • Port: Triangular side slot, 21.4 sq in
  • Cabinet: 32.00" W x 15" H x 9.50/14.96" D

Spec of record

Technical specifications

SeriesProline X Performance Optimized Ported Wedge
Compatible DriverGround Zero GZRW 250-D2 FLAT (dual 2 ohm), quantity 2. Direct fit
External Dimensions32.00" W x 15" H, 14.96" D at the base tapering to 9.50" at the top
Internal Volume, Net1.63 cu ft, one shared chamber (0.82 per driver)
Tuning32.5 Hz
PortTriangular side slot, 21.4 sq in, 25.9 in path
AlignmentF3 34.1 Hz anechoic, ripple 2.2 dB
Driver Openings9.13 in cutout, 10.87 in recess, x2 at 8.625 / 23.375 in
Driver MountingThreaded insert kit included, NOT pre-installed: Ground Zero prints no bolt circle
Driver Displacement0.038 cu ft each, estimated; Ground Zero publishes none
Parameter SourceGround Zero GZRW 250-D2 FLAT owner's manual; cone area derived
Motor Clearance3.84 in to the port panel
Bracing2 windowed C braces
MaterialLangboard Elite MDF, V-groove and dado joinery
Front Baffle1.5 in double baffle
Terminal CupOne, side mounted, pre wired 12 gauge OFC to both drivers
Acrylic InsertGloss black acrylic baffle insert standard
DampingNone, ships dry
CarpetPlush black
Shipping Weight58 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
1.63
cu ft
Tuning
32.5
Hz · Fb
Half power
34.1
Hz · F3, anechoic
Xmax at
6872
W RMS · 26 Hz subsonic
With NO filter
1120
W RMS · unfiltered
Port
13.2
m/s at the mouth

01Is this driver right for a ported box?

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

EBP = Fs ÷ Qes = 46.7
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 EBP 46.7
Ground Zero GZRW 250-D2 FLAT · EBP 46.7
Under 50 the raw number leans sealed. The Ground Zero GZRW 250-D2 FLAT reads 46.7, so this is a ported build against the grain of its own EBP: it works because the alignment is tuned for in-car response rather than for an anechoic curve, and because the cabinet holds port area and volume the driver can actually use.

02What the box does to it

1.63 cu ft net against a 71.6 L Vas, vented at 32.5 Hz.

Fb = 32.5 Hz  ·  F3 = 34.1 Hz  ·  passband ripple 2.21 dB
20 30 50 70 100 150 200 +4 0 −4 −8 −12 −16 −20 −24 −28 FREQUENCY · Hz LEVEL · dB −3 dB Fb 32.5
Ground Zero GZRW 250-D2 FLAT · Fb 32.5 Hz, F3 34.1 Hz
Anechoic, before any cabin gain, with the 26 Hz subsonic filter already applied. The vent takes over below 32 Hz and the cone stops doing the work there, which is what holds travel down at the bottom of the passband.

03Ported vs Sealed

No sealed comparison is shown for this driver.

A ported-versus-sealed chart is only worth reading against a sealed box someone would actually build: the one we make for the driver, or the one its maker recommends. Neither exists for the Ground Zero GZRW 250-D2 FLAT — we do not build a sealed enclosure for it and Ground Zero publish no sealed volume for it — so rather than compare this cabinet against itself stuffed and sealed, a box no one would build, the comparison is left out.

04The watts that reach Xmax (in this enclosure)

Travel scales with the square root of power, so there is one wattage that puts both cones exactly on Ground Zero's published 22.0 mm. The two traces are the same cabinet with the subsonic filter switched on and switched off. Every power figure in this section is for the pair, split evenly.

PXmax = 6872 W with a 26 Hz subsonic  ·  1120 W with none  →  the filter is worth 6.1×
20 30 50 70 100 150 200 0 8 16 24 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 22.0 mm 6872 W reaches Xmax here
6872 W · subsonic at 26 Hz, 24 dB/oct1120 W · no subsonic filterXmax 22.0 mm one-way, published
Each trace touches the limit and no further, because each is drawn at the exact power that puts the cone on 22.0 mm. With a 26 Hz subsonic that takes 6872 W, reached first at 50 Hz. Take the filter away and the same cabinet reaches 22.0 mm on 1120 W — the filter is worth 6.1× the safe power. A vent unloads the cone below tuning, so there is nothing holding it once the box stops loading: on a sealed build a subsonic filter is an improvement, here it is required equipment. The unfiltered trace is still rising where this chart stops at 20 Hz, so treat 1120 W as a bound rather than a floor. Every wattage on this page is a MECHANICAL limit, not an electrical one. It is the power at which the cone runs out of linear travel in this cabinet, and nothing more. What the voice coil can dissipate as heat is a separate ceiling set by the driver, not by the box — Ground Zero rate this one at 800 W RMS, and that is the number that binds first here: heat stops you before travel does, so treat 800 W as the ceiling and the travel figures above as headroom. Final wired impedance, amplifier output and how long you hold the level are all electrical questions this graph does not answer.

From the shop floor

Installer's take

Two GZRW 250-D2 FLATs on 1.63 cubic feet at 32.5 Hz, one shared chamber, 34.1 Hz anechoic. The mouth runs about 13 m/s with both at 400 watts.

Drivers sit at 8.625 and 23.375 from the mouth side, braces between them, each motor inside a brace window.

No bolt circle is published, so the inserts ship in the kit. Ships dry, subsonic near 26 Hz.

Before you order

Questions

Why is this enclosure tuned to 32.5 Hz?

This cabinet gives the pair 1.63 cubic feet in one shared chamber, 0.82 per driver, vented at 32.5 Hz through a 21.4 square inch triangular port, and reaches 34.1 Hz anechoic. Ground Zero's own vented recommendation for one GZRW 250-D2 FLAT is 0.71 cubic feet net with a single 7 cm round port, F3 37 Hz; each driver gets a little more air than that here, in a 32 by 15 inch dual wedge, with a far larger port. The port runs 20.6 m/s in the channel and 13.2 at the flared mouth with both drivers at 400 watts, and each cone peaks at 7.5 of its 22 mm. Passband ripple is 2.2 dB. Our sealed dual wedge (PO 10D-S W GZRW250F) holds 1.00 cubic feet per chamber at Qtc 0.81 with half power at 37 Hz; this ported box reaches deeper.

Why the 20 degree wedge, and why rear-firing?

The rake on the back matches a factory rear seat so the cabinet sits flush and the trunk floor in front stays usable; the baffle is vertical and fires rearward, using the trunk as an acoustic extension.

Do I need a subsonic filter?

Yes. Below 32.5 Hz the port no longer controls the cones; set the filter near 26 Hz.

How much power can I run, and at what impedance?

Ground Zero rates the GZRW 250-D2 FLAT at 400 watts RMS per driver, 800 across the pair; aim for 280 to 400 per driver. Each GZRW 250-D2 FLAT has two 2 ohm coils: a pair lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. 0.5 ohm, everything in parallel, is outside what most amplifiers are built for.

Would a sealed box be better for me?

Our sealed dual GZRW 250-D2 FLAT wedge holds 1.00 cubic feet per chamber at Qtc 0.81, half power 37 Hz: tighter and smaller. This ported box reaches 34.1 Hz on the same pair.

How does the side port work?

The port is a triangular slot along the back, 25.9 inches of path, exiting through the side panel with a rounded mouth so the air leaves without a sharp edge to chuff on.

Does this enclosure ship with polyfill?

No, and do not add any: fill in a ported box detunes it.

Are the GZRW 250-D2 FLATs included?

No. This is an enclosure only, for a pair you supply. You receive the cabinet in plush black carpet with the gloss black acrylic insert, the side-mounted pre-wired terminal cup and a threaded insert kit with stainless machine screws.

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