JBL Club WS1200 (SSI set to 4 ohm)

12″ subwoofer · 4 Ω · 250 W RMS

Fs 22.8 HzQts 0.54Vas 3.45 ft³Xmax 0.30″

Recommended box

For a sedan, one sub, 250 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 volume1.77 ft³ (50 L)
Qtc0.93
Fc39 Hz
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 15/16″
Open sealed box in designer

Ported

Net volume3.00 ft³ (85 L)
Tuning (Fb)29 Hz
Portslot 1 9/16 × 14 5/16″, 20″ long
Port velocity at 250 W52 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 5/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs22.8 Hz
Qts0.54
Qes0.64
Qms3.57
Vas3.45 ft³
Re4.16 Ω
Sd77.9 in²
Xmax0.30″
Vd23.6 in³ calc.
Mms178 g calc.
BL12.9 T·m calc.
EBP36 — suits sealed calc.
Sensitivity, 1 W / 1 m84.6 dB calc.

General

Size12″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø12 3/16″cutout Ø11 1/8″mounting depth 3 1/4″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth3 1/4″
Overall diameter12 3/16″

“≈” 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 JBL 12″ models