Massive Audio UFO12

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 33.2 HzQts 0.77Vas 1.11 ft³Xmax 0.31″

Recommended box

For a sedan, one sub, 300 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 volume1.66 ft³ (47 L)
Qtc1.00
Fc43 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 1/2″
Open sealed box in designer

Ported

Net volume2.83 ft³ (80 L)
Tuning (Fb)30 Hz
Portslot 1 9/16 × 14 5/16″, 19 13/16″ long
Port velocity at 300 W63 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33.2 Hz
Qts0.77
Qes0.91
Qms5.18
Vas1.11 ft³
Re (one coil)3.4 Ω
Sd73 in²
Xmax0.31″
Vd23 in³ calc.
Mms231 g calc.
BL13.4 T·m calc.
EBP36 — suits sealed calc.
Sensitivity, 1 W / 1 m83 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power300 W

Mounting dimensions

Ø12 5/16″cutout Ø10 9/16″mounting depth 3 1/8″magnet Ø≈ 6 7/8″
Cutout diameter10 9/16″
Mounting depth3 1/8″
Overall diameter12 5/16″

“≈” 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 12″ models