Gladen SQX 08 (SVC 4 ohm)

8″ subwoofer · 4 Ω · 250 W RMS

Fs 45.9 HzQts 0.49Vas 0.47 ft³Xmax 0.31″

Recommended box

For a sedan, one sub, 250 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)
Qtc0.78
Fc72 Hz
F3 (−3 dB, no cabin gain)70 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume0.92 ft³ (26 L)
Tuning (Fb)39 Hz
Portslot 1 9/16 × 14 5/16″, 39 1/4″ long
Port velocity at 250 W40 ft/s
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs45.9 Hz
Qts0.49
Qes0.54
Qms5.82
Vas0.47 ft³
Re3.2 Ω
Sd34.3 in²
Xmax0.31″
Vd10.8 in³ calc.
Mms63 g calc.
BL10.3 T·m calc.
EBP85 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.8 dB calc.

General

Size8″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø8 1/2″cutout Ø7 3/16″mounting depth 4 1/8″magnet Ø≈ 4 11/16″
Cutout diameter7 3/16″
Mounting depth4 1/8″
Overall diameter8 1/2″

“≈” 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 Gladen 8″ models