JBL Selenium 12SWX 4+4

12″ subwoofer · dual 4 Ω · 450 W RMS

Fs 52.6 HzQts 0.37Vas 1.35 ft³Xmax 0.30″

Recommended box

For a sedan, one sub, 450 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 volume0.78 ft³ (22 L)
Qtc0.62
Fc87 Hz
F3 (−3 dB, no cabin gain)106 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume1.66 ft³ (47 L)
Tuning (Fb)50 Hz
Port2 round ports Ø2 1/2″, 4 9/16″ long
Port velocity at 450 W186 ft/s
F3 (−3 dB, no cabin gain)49 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 5/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs52.6 Hz
Qts0.37
Qes0.38
Qms19.8
Vas1.35 ft³
Re (one coil)2.6 Ω
Sd86.2 in²
Xmax0.30″
Vd25.4 in³ calc.
Mms105 g calc.
BL15.4 T·m calc.
EBP138 — suits ported calc.
Sensitivity, 1 W / 1 m93.7 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power450 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth ≈ 5 7/8″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/8″
Mounting depth≈ 5 7/8″

“≈” 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 JBL Selenium 12″ models