Massive Audio SUMMO84S

8″ subwoofer · dual 4 Ω · 400 W RMS

Fs 51.3 HzQts 0.61Vas 0.20 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 400 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
Fc66 Hz
F3 (−3 dB, no cabin gain)62 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 5/8″
Open sealed box in designer

Ported

Net volume0.74 ft³ (21 L)
Tuning (Fb)37 Hz
Portround port Ø3″, 16 5/16″ long
Port velocity at 400 W149 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)20 3/4″ × 15 3/4″ × 6 7/8″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs51.3 Hz
Qts0.61
Qes0.678
Qms6.27
Vas0.20 ft³
Re (one coil)3.2 Ω
Sd33.2 in²
Xmax0.35″
Vd11.8 in³ calc.
Mms107 g calc.
BL12.8 T·m calc.
EBP76 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.6 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø8 11/16″cutout Ø7 5/16″mounting depth 4 7/16″magnet Ø≈ 4 3/4″
Cutout diameter7 5/16″
Mounting depth4 7/16″
Overall diameter8 11/16″

“≈” 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