Black Hydra Gamma-12

12″ subwoofer · 4 Ω · 400 W RMS

Fs 30.2 HzQts 0.48Vas 2.34 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 400 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 volume1.31 ft³ (37 L)
Qtc0.80
Fc50 Hz
F3 (−3 dB, no cabin gain)48 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 16 7/16″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)31 Hz
Portslot 1 15/16 × 14 5/16″, 22 3/8″ long
Port velocity at 400 W60 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30.2 Hz
Qts0.48
Qes0.522
Qms6
Vas2.34 ft³
Re≈ 3.4 Ω
Sd≈ 76 in²
Xmax0.59″
EBP58 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.4 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth ≈ 5 7/8″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/8″
Mounting depth≈ 5 7/8″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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 Black Hydra 12″ models