Massive Audio HIPPO XL84R

8″ subwoofer · dual 4 Ω · 900 W RMS

Fs 48 HzQts 0.72Vas 0.12 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 900 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 volume0.30 ft³ (8.5 L)
Qtc0.85
Fc57 Hz
F3 (−3 dB, no cabin gain)50 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 1/4″
Open sealed box in designer

Ported

Net volume0.71 ft³ (20 L)
Tuning (Fb)38 Hz
Portround port Ø2 1/2″, 11 1/4″ long
Port velocity at 900 W308 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)15 1/2″ × 15 3/4″ × 8 1/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs48 Hz
Qts0.72
Qes0.883
Qms3.92
Vas0.12 ft³
Re (one coil)3.2 Ω
Sd32.6 in²
Xmax0.59″
Vd19.2 in³ calc.
Mms202 g calc.
BL14.9 T·m calc.
EBP54 — sealed or ported calc.
Sensitivity, 1 W / 1 m78.3 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power900 W

Mounting dimensions

Ø8 11/16″cutout Ø7 5/16″mounting depth 5 5/8″magnet Ø≈ 4 3/4″
Cutout diameter7 5/16″
Mounting depth5 5/8″
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