JBL Selenium 15SWX 4+4

15″ subwoofer · dual 4 Ω · 450 W RMS

Fs 44.6 HzQts 0.42Vas 3.37 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 volume1.27 ft³ (36 L)
Qtc0.80
Fc85 Hz
F3 (−3 dB, no cabin gain)81 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 11 5/16″
Open sealed box in designer

Ported

Net volume4.17 ft³ (118 L)
Tuning (Fb)44 Hz
Portslot 2 9/16 × 16 11/16″, 8 3/4″ long
Port velocity at 450 W63 ft/s
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 17 1/4″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs44.6 Hz
Qts0.42
Qes0.43
Qms16.67
Vas3.37 ft³
Re (one coil)2.65 Ω
Sd140.6 in²
Xmax0.30″
Vd41.5 in³ calc.
Mms155 g calc.
BL16.4 T·m calc.
EBP104 — suits ported calc.
Sensitivity, 1 W / 1 m94.9 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power450 W

Mounting dimensions

Ø≈ 15 3/16″cutout ≈ Ø14″mounting depth ≈ 7 1/16″magnet Ø≈ 9 1/16″
Cutout diameter≈ 14″
Mounting depth≈ 7 1/16″

“≈” 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 JBL Selenium 15″ models