Fi Audio Alpha v1 12 S4

12″ subwoofer · 4 Ω · 1,000 W RMS

Fs 36.2 HzQts 0.41Vas 0.91 ft³Xmax 0.67″

Recommended box

For a sedan, one sub, 1,000 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 volume0.67 ft³ (19 L)
Qtc0.63
Fc56 Hz
F3 (−3 dB, no cabin gain)66 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.41 ft³ (40 L)
Tuning (Fb)33 Hz
Portslot 1 3/4 × 14 5/16″, 39 15/16″ long
Port velocity at 1,000 W82 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.2 Hz
Qts0.41
Qes0.44
Qms6.43
Vas0.91 ft³
Re3.3 Ω
Sd74.4 in²
Xmax0.67″
Vd49.8 in³ calc.
Mms244 g calc.
BL20.4 T·m calc.
EBP82 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power1,000 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/16″mounting depth 6 1/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth6 1/8″
Overall diameter12 5/8″

“≈” 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