Massive Audio HIPPO XL84

8″ subwoofer · dual 4 Ω · 700 W RMS

Fs 50 HzQts 0.64Vas 0.12 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 700 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)
Qtc0.74
Fc58 Hz
F3 (−3 dB, no cabin gain)57 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 5/8″
Open sealed box in designer

Ported

Net volume0.64 ft³ (18 L)
Tuning (Fb)39 Hz
Portround port Ø2 1/2″, 11 15/16″ long
Port velocity at 700 W271 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)15 1/16″ × 15 3/4″ × 7 11/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs50 Hz
Qts0.64
Qes0.716
Qms5.69
Vas0.12 ft³
Re (one coil)3.2 Ω
Sd33.2 in²
Xmax0.55″
Vd18.3 in³ calc.
Mms202 g calc.
BL16.8 T·m calc.
EBP70 — sealed or ported calc.
Sensitivity, 1 W / 1 m79.5 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power700 W

Mounting dimensions

Ø8 11/16″cutout Ø7 5/16″mounting depth 5 1/4″magnet Ø≈ 4 3/4″
Cutout diameter7 5/16″
Mounting depth5 1/4″
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