Ground Zero GZTW 25TX (2x2 Ohm)

10″ subwoofer · dual 2 Ω · 300 W RMS

Fs 38.3 HzQts 0.53Vas 1.00 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 300 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume0.74 ft³ (21 L)
Qtc0.80
Fc59 Hz
F3 (−3 dB, no cabin gain)55 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 13 3/8″
Open sealed box in designer

Ported

Net volume2.12 ft³ (60 L)
Tuning (Fb)33 Hz
Portslot 1 9/16 × 14 5/16″, 22 1/4″ long
Port velocity at 300 W58 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 3/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs38.3 Hz
Qts0.53
Qes0.66
Qms2.58
Vas1.00 ft³
Re (one coil)≈ 1.7 Ω
Sd54.4 in²
Xmax0.55″
Vd30 in³ calc.
Mms107 g calc.
BL8.1 T·m calc.
EBP58 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.8 dB calc.

General

Size10″
Voice coilsdual 2 Ω
RMS power300 W

Mounting dimensions

Ø≈ 10 1/4″cutout Ø9 1/16″mounting depth 5 3/16″magnet Ø≈ 5 7/8″
Cutout diameter9 1/16″
Mounting depth5 3/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 54.4 in².

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other Ground Zero 10″ models