Fi Audio SSD15 D2

15″ subwoofer · dual 2 Ω · 1,500 W RMS

Fs 38.3 HzQts 0.39Vas 1.52 ft³Xmax 0.87″

Recommended box

For a sedan, one sub, 1,500 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 volume1.15 ft³ (32.5 L)
Qtc0.60
Fc58 Hz
F3 (−3 dB, no cabin gain)74 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 10 7/16″
Open sealed box in designer

Ported

Net volume2.40 ft³ (68 L)
Tuning (Fb)35 Hz
Portslot 3 1/8 × 16 11/16″, 41 13/16″ long
Port velocity at 1,500 W65 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 15 3/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs38.3 Hz
Qts0.39
Qes0.42
Qms6.05
Vas1.52 ft³
Re (one coil)1.5 Ω
Sd125.6 in²
Xmax0.87″
Vd108.7 in³ calc.
Mms373 g calc.
BL17.9 T·m calc.
EBP91 — sealed or ported calc.
Sensitivity, 1 W / 1 m89.6 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power1,500 W

Mounting dimensions

Ø15 5/8″cutout Ø14 1/8″mounting depth 8″magnet Ø≈ 9 3/16″
Cutout diameter14 1/8″
Mounting depth8″
Overall diameter15 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 15″ models