JL Audio 12TW3-D8

12″ subwoofer · dual 8 Ω · 400 W RMS

Fs 32.7 HzQts 0.67Vas 1.20 ft³Xmax 0.60″

Recommended box

For a sedan, one sub, 400 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)
Qtc0.85
Fc42 Hz
F3 (−3 dB, no cabin gain)37 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)28 Hz
Portslot 2 3/16 × 14 5/16″, 27 15/16″ long
Port velocity at 400 W61 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 3/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.7 Hz
Qts0.67
Qes0.715
Qms10.07
Vas1.20 ft³
Re (one coil)7.4 Ω
Sd83.5 in²
Xmax0.60″
Vd50 in³ calc.
Mms286 g calc.
BL24.7 T·m calc.
EBP46 — suits sealed calc.
Sensitivity, 1 W / 1 m84.2 dB calc.

General

Size12″
Voice coilsdual 8 Ω
RMS power400 W

Mounting dimensions

Ø13 3/16″cutout Ø11 5/8″mounting depth 3 1/2″magnet Ø6 1/8″
Cutout diameter11 5/8″
Mounting depth3 1/2″
Overall diameter13 3/16″
Magnet diameter6 1/8″

“≈” 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 JL Audio 12″ models