Clarion SRW1285

12″ subwoofer · dual 4 Ω · 375 W RMS

Fs 30.1 HzQts 0.81Vas 2.21 ft³Xmax 0.37″

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 volume1.62 ft³ (46 L)
Qtc1.24
Fc46 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 19 13/16″
Open sealed box in designer

Ported

Net volume2.75 ft³ (78 L)
Tuning (Fb)35 Hz
Portslot 1 3/4 × 14 5/16″, 15 15/16″ long
Port velocity at 375 W58 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30.1 Hz
Qts0.81
Qes0.9
Qms8.1
Vas2.21 ft³
Re (one coil)3 Ω
Sd71.1 in²
Xmax0.37″
Vd26.3 in³ calc.
Mms133 g calc.
BL9.2 T·m calc.
EBP33 — suits sealed calc.
Sensitivity, 1 W / 1 m84.8 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power375 W

Mounting dimensions

Ø12 3/8″cutout ≈ Ø11 1/8″mounting depth 6 1/4″magnet Ø≈ 7 1/4″
Cutout diameter≈ 11 1/8″
Mounting depth6 1/4″
Overall diameter12 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 Clarion 12″ models