Crossfire BMF1528

15″ subwoofer · dual 4 Ω · 375 W RMS

Fs 23.5 HzQts 0.69Vas 5.29 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 375 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 volume2.83 ft³ (80 L)
Qtc1.16
Fc40 Hz
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)31 Hz
Portslot 1 3/4 × 16 5/16″, 12 5/16″ long
Port velocity at 375 W64 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 19 15/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs23.5 Hz
Qts0.69
Qes0.77
Qms6.34
Vas5.29 ft³
Re (one coil)3.3 Ω
Sd≈ 124 in²
Xmax0.55″
EBP31 — suits sealed calc.
Sensitivity, 1 W / 1 m86 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power375 W

Mounting dimensions

Ø15 3/8″cutout Ø13 3/4″mounting depth 7 1/2″magnet Ø≈ 8 15/16″
Cutout diameter13 3/4″
Mounting depth7 1/2″
Overall diameter15 3/8″

“≈” 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 Crossfire 15″ models