Black Hydra Delta-12S

12″ subwoofer · 4 Ω · 250 W RMS

Fs 35.1 HzQts 0.82Vas 1.44 ft³Xmax 0.24″

Recommended box

For a sedan, one sub, 250 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 volume1.73 ft³ (49 L)
Qtc1.11
Fc47 Hz
F3 (−3 dB, no cabin gain)37 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)34 Hz
Portslot 1 9/16 × 14 5/16″, 13 7/8″ long
Port velocity at 250 W60 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 9/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35.1 Hz
Qts0.82
Qes0.95
Qms6
Vas1.44 ft³
Re3.6 Ω
Sd≈ 76 in²
Xmax0.24″
EBP37 — suits sealed calc.
Sensitivity, 1 W / 1 m84.7 dB calc.

General

Size12″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø≈ 12 3/16″cutout Ø11″mounting depth 2 5/8″magnet Ø≈ 7 3/16″
Cutout diameter11″
Mounting depth2 5/8″

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