JL Audio 12TW1-4

12″ subwoofer · 4 Ω · 300 W RMS

Fs 32.4 HzQts 0.53Vas 1.19 ft³Xmax 0.39″

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 volume0.92 ft³ (26 L)
Qtc0.80
Fc49 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 12 5/16″
Open sealed box in designer

Ported

Net volume2.61 ft³ (74 L)
Tuning (Fb)28 Hz
Portslot 1 9/16 × 14 5/16″, 25 1/2″ long
Port velocity at 300 W65 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.4 Hz
Qts0.53
Qes0.555
Qms11.07
Vas1.19 ft³
Re3.51 Ω
Sd67.6 in²
Xmax0.39″
Vd26.6 in³ calc.
Mms194 g calc.
BL15.8 T·m calc.
EBP58 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.1 dB calc.

General

Size12″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø12 3/8″cutout Ø11 1/16″mounting depth 4 5/8″magnet Ø5 11/16″
Cutout diameter11 1/16″
Mounting depth4 5/8″
Overall diameter12 3/8″
Magnet diameter5 11/16″

“≈” 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 JL Audio 12″ models