STX W.30.500.2x4.MC

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 29 HzQts 0.39Vas 2.19 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 volume0.71 ft³ (20 L)
Qtc0.80
Fc59 Hz
F3 (−3 dB, no cabin gain)56 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 9 9/16″
Open sealed box in designer

Ported

Net volume2.26 ft³ (64 L)
Tuning (Fb)31 Hz
Portslot 1 9/16 × 14 5/16″, 23 7/8″ long
Port velocity at 300 W56 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 5/8″
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
Qes0.45
Qms3.2
Vas2.19 ft³
Re (one coil)2.9 Ω
Sd76 in²
Xmax0.28″
Vd20.9 in³ calc.
Mms165 g calc.
BL13.9 T·m calc.
EBP64 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.3 dB calc.

General

Size12″
Voice coilsdual 4 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