Fi Audio BL15v3.1 D1

15″ subwoofer · dual 1 Ω · 1,750 W RMS

Fs 34.8 HzQts 0.34Vas 2.40 ft³Xmax 0.79″

Recommended box

For a sedan, one sub, 1,750 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 volume1.18 ft³ (33.5 L)
Qtc0.60
Fc61 Hz
F3 (−3 dB, no cabin gain)77 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 10 11/16″
Open sealed box in designer

Ported

Net volume2.40 ft³ (68 L)
Tuning (Fb)36 Hz
Portslot 3 3/8 × 16 11/16″, 41 13/16″ long
Port velocity at 1,750 W65 ft/s
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 15 5/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.8 Hz
Qts0.34
Qes0.36
Qms7.81
Vas2.40 ft³
Re (one coil)0.7 Ω
Sd125.6 in²
Xmax0.79″
Vd98.9 in³ calc.
Mms285 g calc.
BL11 T·m calc.
EBP97 — sealed or ported calc.
Sensitivity, 1 W / 1 m91 dB calc.

General

Size15″
Voice coilsdual 1 Ω
RMS power1,750 W

Mounting dimensions

Ø15 5/8″cutout Ø14 1/8″mounting depth 8 1/4″magnet Ø≈ 9 3/16″
Cutout diameter14 1/8″
Mounting depth8 1/4″
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