Fi Audio Alpha v1 15 S1

15″ subwoofer · 1 Ω · 1,000 W RMS

Fs 34.7 HzQts 0.52Vas 2.15 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 volume1.62 ft³ (46 L)
Qtc0.80
Fc53 Hz
F3 (−3 dB, no cabin gain)50 Hz
Example box (outside)16 15/16″ × 16 15/16″ × 14 3/8″
Open sealed box in designer

Ported

Net volume4.87 ft³ (138 L)
Tuning (Fb)29 Hz
Portslot 3 9/16 × 16 5/16″, 31 3/8″ long
Port velocity at 1,000 W64 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 23 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.7 Hz
Qts0.52
Qes0.56
Qms8.1
Vas2.15 ft³
Re0.8 Ω
Sd125.6 in²
Xmax0.67″
Vd84 in³ calc.
Mms321 g calc.
BL10 T·m calc.
EBP62 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.6 dB calc.

General

Size15″
Voice coils1 Ω
RMS power1,000 W

Mounting dimensions

Ø15 1/2″cutout Ø13 7/8″mounting depth 7 3/8″magnet Ø≈ 9″
Cutout diameter13 7/8″
Mounting depth7 3/8″
Overall diameter15 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 15″ models