STX W.30.500.2x2.MC

12″ subwoofer · dual 2 Ω · 300 W RMS

Fs 29 HzQts 0.39Vas 2.68 ft³Xmax 0.28″

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 volume0.85 ft³ (24 L)
Qtc0.80
Fc59 Hz
F3 (−3 dB, no cabin gain)57 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 10 15/16″
Open sealed box in designer

Ported

Net volume2.72 ft³ (77 L)
Tuning (Fb)31 Hz
Portslot 1 9/16 × 14 5/16″, 19 3/16″ long
Port velocity at 300 W62 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29 Hz
Qts0.39
Qes0.43
Qms4.4
Vas2.68 ft³
Re (one coil)1.8 Ω
Sd76 in²
Xmax0.28″
Vd20.9 in³ calc.
Mms135 g calc.
BL10.1 T·m calc.
EBP67 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.4 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power300 W

Mounting dimensions

Ø12 1/4″cutout Ø11 1/4″mounting depth 5 3/8″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth5 3/8″
Overall diameter12 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 STX 12″ models