JBL Selenium 18SWT5600

18″ subwoofer · 4 Ω · 2,800 W RMS

Fs 56.7 HzQts 0.68Vas 2.19 ft³Xmax 0.43″

Recommended box

For a sedan, one sub, 2,800 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 volume3.71 ft³ (105 L)
Qtc0.86
Fc71 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)31 1/2″ × 20 1/2″ × 13 7/16″
Open sealed box in designer

Ported

Net volume6.29 ft³ (178 L)
Tuning (Fb)44 Hz
Portslot 5 7/8 × 19 1/16″, 15 15/16″ long
Port velocity at 2,800 W79 ft/s
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 20 1/2″ × 24 9/16″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs56.7 Hz
Qts0.68
Qes0.7
Qms24.1
Vas2.19 ft³
Re3.21 Ω
Sd162.3 in²
Xmax0.43″
Vd70.3 in³ calc.
Mms198 g calc.
BL18 T·m calc.
EBP81 — sealed or ported calc.
Sensitivity, 1 W / 1 m94.1 dB calc.

General

Size18″
Voice coils4 Ω
RMS power2,800 W

Mounting dimensions

Ø≈ 17 11/16″cutout ≈ Ø16 9/16″mounting depth ≈ 8 1/4″magnet Ø≈ 10 3/4″
Cutout diameter≈ 16 9/16″
Mounting depth≈ 8 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 JBL Selenium 18″ models