JBL Club 1224 (SSI set to 4 ohm)

12″ subwoofer · 4 Ω · 275 W RMS

Fs 32.4 HzQts 0.58Vas 2.11 ft³Xmax 0.41″

Recommended box

For a sedan, one sub, 275 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 volume1.84 ft³ (52 L)
Qtc0.85
Fc47 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/16″
Open sealed box in designer

Ported

Net volume3.14 ft³ (89 L)
Tuning (Fb)33 Hz
Portslot 1 9/16 × 14 5/16″, 13 11/16″ long
Port velocity at 275 W63 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 3/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.4 Hz
Qts0.58
Qes0.72
Qms3.02
Vas2.11 ft³
Re4.4 Ω
Sd81 in²
Xmax0.41″
Vd32.9 in³ calc.
Mms156 g calc.
BL14 T·m calc.
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m86.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power275 W

Mounting dimensions

Ø12 15/16″cutout Ø11 1/4″mounting depth 6 1/2″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth6 1/2″
Overall diameter12 15/16″

“≈” 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