Earthquake SWS-6.5X

6.5″ subwoofer · 4 Ω · 100 W RMS

Fs 39.3 HzQts 1.22Vas 0.35 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 100 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 volume0.46 ft³ (13 L)
Qtc1.62
Fc52 Hz
F3 (−3 dB, no cabin gain)37 Hz
Example box (outside)9 1/16″ × 9 1/16″ × 15 9/16″
Open sealed box in designer

Ported

Net volume0.74 ft³ (21 L)
Tuning (Fb)41 Hz
Portround port Ø2 1/2″, 8 7/8″ long
Port velocity at 100 W77 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)14 3/16″ × 15 3/4″ × 8 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.3 Hz
Qts1.22
Qes1.723
Qms4.19
Vas0.35 ft³
Re3.6 Ω
Sd19.4 in²
Xmax0.59″
Vd11.4 in³ calc.
Mms36 g calc.
BL4.3 T·m calc.
EBP23 — suits sealed calc.
Sensitivity, 1 W / 1 m77.5 dB calc.

General

Size6.5″
Voice coils4 Ω
RMS power100 W

Mounting dimensions

Ø≈ 6 15/16″cutout Ø5 3/4″mounting depth 1 3/4″magnet Ø≈ 3 3/4″
Cutout diameter5 3/4″
Mounting depth1 3/4″

“≈” 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