JL Audio 12W0v3-4

12″ subwoofer · 4 Ω · 300 W RMS

Fs 28.4 HzQts 0.67Vas 2.53 ft³Xmax 0.45″
The published specs don’t add up:

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 volume1.70 ft³ (48 L)
Qtc1.06
Fc45 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 5/8″
Open sealed box in designer

Ported

Net volume2.90 ft³ (82 L)
Tuning (Fb)33 Hz
Portslot 1 9/16 × 14 5/16″, 15 3/16″ long
Port velocity at 300 W62 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/2″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.4 Hz
Qts0.67
Qes0.715
Qms10.71
Vas2.53 ft³
Re4.28 Ω
Sd74.6 in²
Xmax0.45″
Vd33.5 in³ calc.
Mms143 g calc.
BL12.4 T·m calc.
EBP40 — suits sealed calc.
Sensitivity, 1 W / 1 m85.6 dB calc.

General

Size12″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø12 1/2″cutout Ø11 1/16″mounting depth 5 3/8″magnet Ø5 1/4″
Cutout diameter11 1/16″
Mounting depth5 3/8″
Overall diameter12 1/2″
Magnet diameter5 1/4″

“≈” 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