Fi Audio IB312 v2 S4

12″ subwoofer · 4 Ω · 600 W RMS

Fs 27.3 HzQts 0.67Vas 1.56 ft³Xmax 1.34″

Recommended box

For a sedan, one sub, 600 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 volume1.70 ft³ (48 L)
Qtc0.92
Fc38 Hz
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 20 9/16″
Open sealed box in designer

Ported

Net volume2.90 ft³ (82 L)
Tuning (Fb)27 Hz
Portslot 2 3/16 × 14 5/16″, 34 11/16″ long
Port velocity at 600 W62 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27.3 Hz
Qts0.67
Qes0.73
Qms7.65
Vas1.56 ft³
Re3.6 Ω
Sd74.4 in²
Xmax1.34″
Vd99.6 in³ calc.
Mms251 g calc.
BL14.6 T·m calc.
EBP37 — suits sealed calc.
Sensitivity, 1 W / 1 m82.9 dB calc.

General

Size12″
Voice coils4 Ω
RMS power600 W

Mounting dimensions

Ø12 1/2″cutout Ø11 1/8″mounting depth 6 1/2″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth6 1/2″
Overall diameter12 1/2″

“≈” 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 Fi Audio 12″ models