JL Audio 13W3v3-4

13.5″ subwoofer · 4 Ω · 600 W RMS

Fs 23.7 HzQts 0.44Vas 4.79 ft³Xmax 0.61″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 600 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 volume2.01 ft³ (57 L)
Qtc0.80
Fc44 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)15 3/4″ × 15 3/4″ × 19 13/16″
Open sealed box in designer

Ported

Net volume4.03 ft³ (114 L)
Tuning (Fb)29 Hz
Portslot 2 3/8 × 15 1/8″, 23 1/4″ long
Port velocity at 600 W64 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 16 9/16″ × 19 5/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs23.7 Hz
Qts0.44
Qes0.465
Qms6.77
Vas4.79 ft³
Re3.57 Ω
Sd103.9 in²
Xmax0.61″
Vd63.4 in³ calc.
Mms212 g calc.
BL15.6 T·m calc.
EBP51 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.9 dB calc.

General

Size13.5″
Voice coils4 Ω
RMS power600 W

Mounting dimensions

Ø14″cutout Ø12 9/16″mounting depth 7 5/8″magnet Ø5 13/16″
Cutout diameter12 9/16″
Mounting depth7 5/8″
Overall diameter14″
Magnet diameter5 13/16″

“≈” 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 13.5″ models