Massive Audio GTS8

8″ subwoofer · dual 4 Ω · 220 W RMS

Fs 55.4 HzQts 0.91Vas 0.31 ft³Xmax 0.28″

Recommended box

For a sedan, one sub, 220 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 volume0.60 ft³ (17 L)
Qtc1.12
Fc68 Hz
F3 (−3 dB, no cabin gain)53 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 15 9/16″
Open sealed box in designer

Ported

Net volume1.27 ft³ (36 L)
Tuning (Fb)40 Hz
Portslot 1 9/16 × 14 5/16″, 25 3/4″ long
Port velocity at 220 W45 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs55.4 Hz
Qts0.91
Qes1.138
Qms4.66
Vas0.31 ft³
Re (one coil)3.4 Ω
Sd33.1 in²
Xmax0.28″
Vd9.1 in³ calc.
Mms62 g calc.
BL8 T·m calc.
EBP49 — suits sealed calc.
Sensitivity, 1 W / 1 m83.1 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power220 W

Mounting dimensions

Ø8 7/16″cutout Ø7 3/16″mounting depth 2 13/16″magnet Ø≈ 4 11/16″
Cutout diameter7 3/16″
Mounting depth2 13/16″
Overall diameter8 7/16″

“≈” 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 Massive Audio 8″ models