STX W.20.300.2x2.MC

8″ subwoofer · dual 2 Ω · 200 W RMS

Fs 33 HzQts 0.41Vas 0.92 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 200 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 volume0.32 ft³ (9 L)
Qtc0.81
Fc65 Hz
F3 (−3 dB, no cabin gain)62 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume1.06 ft³ (30 L)
Tuning (Fb)34 Hz
Port2 round ports Ø2 1/2″, 19 15/16″ long
Port velocity at 200 W77 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/8″ × 15 3/4″ × 6 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33 Hz
Qts0.41
Qes0.45
Qms4.5
Vas0.92 ft³
Re (one coil)1.65 Ω
Sd33.2 in²
Xmax0.35″
Vd11.8 in³ calc.
Mms58 g calc.
BL6.6 T·m calc.
EBP73 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.2 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power200 W

Mounting dimensions

Ø8 1/4″cutout Ø7 1/16″mounting depth 3 15/16″magnet Ø≈ 4 5/8″
Cutout diameter7 1/16″
Mounting depth3 15/16″
Overall diameter8 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 8″ models