Earthquake SWS-8X

8″ subwoofer · 4 Ω · 150 W RMS

Fs 30.4 HzQts 0.67Vas 0.98 ft³Xmax 0.91″

Recommended box

For a sedan, one sub, 150 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 volume0.78 ft³ (22 L)
Qtc1.01
Fc46 Hz
F3 (−3 dB, no cabin gain)37 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 4 11/16″
Open sealed box in designer

Ported

Net volume1.31 ft³ (37 L)
Tuning (Fb)33 Hz
Portslot 1 9/16 × 14 5/16″, 38 1/2″ long
Port velocity at 150 W29 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30.4 Hz
Qts0.67
Qes0.804
Qms3.99
Vas0.98 ft³
Re3.5 Ω
Sd34.1 in²
Xmax0.91″
Vd30.9 in³ calc.
Mms68 g calc.
BL7.5 T·m calc.
EBP38 — suits sealed calc.
Sensitivity, 1 W / 1 m81.9 dB calc.

General

Size8″
Voice coils4 Ω
RMS power150 W

Mounting dimensions

Ø≈ 9 1/16″cutout Ø7 7/8″mounting depth 2 1/8″magnet Ø≈ 5 1/8″
Cutout diameter7 7/8″
Mounting depth2 1/8″

“≈” 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