B2 Audio IS12 D4 v3

12″ subwoofer · dual 4 Ω · 750 W RMS

Fs 38 HzQts 0.70Vas 0.88 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 volume1.73 ft³ (49 L)
Qtc0.86
Fc47 Hz
F3 (−3 dB, no cabin gain)41 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)30 Hz
Portslot 2 3/4 × 14 5/16″, 34 13/16″ long
Port velocity at 750 W64 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs38 Hz
Qts0.70
Qes0.79
Qms6.3
Vas0.88 ft³
Re (one coil)3.3 Ω
Sd≈ 76 in²
Xmax0.71″
EBP48 — suits sealed calc.
Sensitivity, 1 W / 1 m84.4 dB calc.

General

Size12″
Voice coilsdual 4 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