JBL Selenium 12SW26A 4+4

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 39 HzQts 0.72Vas 2.55 ft³Xmax 0.24″

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 volume1.80 ft³ (51 L)
Qtc1.13
Fc61 Hz
F3 (−3 dB, no cabin gain)48 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)44 Hz
Portslot 1 3/4 × 14 5/16″, 7 1/4″ long
Port velocity at 300 W63 ft/s
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 11/16″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39 Hz
Qts0.72
Qes0.81
Qms6.83
Vas2.55 ft³
Re (one coil)3.35 Ω
Sd79.1 in²
Xmax0.24″
Vd18.7 in³ calc.
Mms85 g calc.
BL9.3 T·m calc.
EBP48 — suits sealed calc.
Sensitivity, 1 W / 1 m89.2 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power300 W

Mounting dimensions

Ø≈ 12 1/4″cutout Ø11 1/16″mounting depth ≈ 5 7/8″magnet Ø5 1/4″
Cutout diameter11 1/16″
Mounting depth≈ 5 7/8″
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 JBL Selenium 12″ models