Clarion SW1251

12″ subwoofer · 4 Ω

Fs 29.9 HzQts 0.62Vas 2.40 ft³Xmax 0.47″

Recommended box

For a sedan, one sub, 300 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 volume1.91 ft³ (54 L)
Qtc0.93
Fc45 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/2″
Open sealed box in designer

Ported

Net volume3.25 ft³ (92 L)
Tuning (Fb)32 Hz
Portslot 1 3/4 × 14 5/16″, 16 1/4″ long
Port velocity at 300 W58 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 1/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.9 Hz
Qts0.62
Qes0.685
Qms6.57
Vas2.40 ft³
Re3.66 Ω
Sd83.6 in²
Xmax0.47″
Vd39.5 in³ calc.
Mms172 g calc.
BL13.1 T·m calc.
EBP44 — suits sealed calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

General

Size12″
Voice coils4 Ω
RMS power—

Mounting dimensions

Ø12 5/16″cutout ≈ Ø11 1/16″mounting depth 6 7/16″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/16″
Mounting depth6 7/16″
Overall diameter12 5/16″

“≈” 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 Clarion 12″ models