JL Audio 12TW3-D4

12″ subwoofer · dual 4 Ω · 400 W RMS

Fs 26.5 HzQts 0.53Vas 1.72 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 volume1.34 ft³ (38 L)
Qtc0.80
Fc40 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 7 1/4″
Open sealed box in designer

Ported

Net volume3.25 ft³ (92 L)
Tuning (Fb)25 Hz
Portslot 1 15/16 × 14 5/16″, 32 3/4″ long
Port velocity at 400 W61 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26.5 Hz
Qts0.53
Qes0.558
Qms10.77
Vas1.72 ft³
Re (one coil)4.64 Ω
Sd83.5 in²
Xmax0.60″
Vd50 in³ calc.
Mms306 g calc.
BL20.6 T·m calc.
EBP47 — suits sealed calc.
Sensitivity, 1 W / 1 m84.1 dB calc.

General

Size12″
Voice coilsdual 4 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