Crossfire C7 15D1

15″ subwoofer · dual 1 Ω · 1,200 W RMS

Fs 31 HzQts 0.47Vas 2.44 ft³Xmax 0.67″

Recommended box

For a sedan, one sub, 1,200 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 volume1.38 ft³ (39 L)
Qtc0.78
Fc52 Hz
F3 (−3 dB, no cabin gain)50 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 12″
Open sealed box in designer

Ported

Net volume4.20 ft³ (119 L)
Tuning (Fb)29 Hz
Portslot 3 3/8 × 16 11/16″, 36 1/16″ long
Port velocity at 1,200 W65 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 21 3/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31 Hz
Qts0.47
Qes0.51
Qms6.01
Vas2.44 ft³
Re (one coil)1 Ω
Sd126.2 in²
Xmax0.67″
Vd84.4 in³ calc.
Mms359 g calc.
BL11.7 T·m calc.
EBP61 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.1 dB calc.

General

Size15″
Voice coilsdual 1 Ω
RMS power1,200 W

Mounting dimensions

Ø15 9/16″cutout ≈ Ø14″mounting depth 9 5/8″magnet Ø≈ 9 1/8″
Cutout diameter≈ 14″
Mounting depth9 5/8″
Overall diameter15 9/16″

“≈” 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