Crossfire C7 12D2

12″ subwoofer · dual 2 Ω · 1,200 W RMS

Fs 36 HzQts 0.40Vas 0.88 ft³Xmax 0.63″

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 volume0.81 ft³ (23 L)
Qtc0.58
Fc52 Hz
F3 (−3 dB, no cabin gain)68 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 10 9/16″
Open sealed box in designer

Ported

Net volume1.48 ft³ (42 L)
Tuning (Fb)32 Hz
Portround port Ø2 1/2″, 6 15/16″ long
Port velocity at 1,200 W460 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)22 1/2″ × 15 3/4″ × 10 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36 Hz
Qts0.40
Qes0.43
Qms6.33
Vas0.88 ft³
Re (one coil)2 Ω
Sd77.3 in²
Xmax0.63″
Vd48.7 in³ calc.
Mms276 g calc.
BL17 T·m calc.
EBP84 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.3 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,200 W

Mounting dimensions

Ø12 5/8″cutout ≈ Ø11 5/16″mounting depth 8 3/16″magnet Ø≈ 7 3/8″
Cutout diameter≈ 11 5/16″
Mounting depth8 3/16″
Overall diameter12 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 Crossfire 12″ models