B2 Audio IS12 D2 v3

12″ subwoofer · dual 2 Ω · 750 W RMS

Fs 32.1 HzQts 0.54Vas 1.17 ft³Xmax 0.71″

Recommended box

For a sedan, one sub, 750 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 volume0.95 ft³ (27 L)
Qtc0.80
Fc48 Hz
F3 (−3 dB, no cabin gain)45 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 12″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)27 Hz
Portslot 2 9/16 × 14 5/16″, 40 7/8″ long
Port velocity at 750 W64 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.1 Hz
Qts0.54
Qes0.59
Qms5.84
Vas1.17 ft³
Re (one coil)1.9 Ω
Sd≈ 76 in²
Xmax0.71″
EBP54 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.7 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power750 W

Mounting dimensions

Ø12 9/16″cutout ≈ Ø11 5/16″mounting depth ≈ 5 7/8″magnet Ø≈ 7 3/8″
Cutout diameter≈ 11 5/16″
Mounting depth≈ 5 7/8″
Overall diameter12 9/16″

“≈” 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 B2 Audio 12″ models