Pride UFO.4 15 D0.7

15″ subwoofer · dual 0.7 Ω · 5,000 W RMS

Fs 30 HzQts 0.16Vas 2.22 ft³Xmax 1.57″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 5,000 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 volume1.61 ft³ (45.5 L)
Qtc0.25
Fc46 Hz
F3 (−3 dB, no cabin gain)178 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 13 5/8″
Open sealed box in designer

Ported

Net volume2.54 ft³ (72 L)
Tuning (Fb)27 Hz
Portslot 2 3/8 × 16 11/16″, 51 11/16″ long
Port velocity at 5,000 W155 ft/s
F3 (−3 dB, no cabin gain)172 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 15 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30 Hz
Qts0.16
Qes0.164
Qms6
Vas2.22 ft³
Re (one coil)2.8 Ω
Sd132.5 in²
Xmax1.57″
Vd208.7 in³ calc.
Mms463 g calc.
BL38.6 T·m calc.
EBP183 — suits ported calc.
Sensitivity, 1 W / 1 m92.2 dB calc.

General

Size15″
Voice coilsdual 0.7 Ω
RMS power5,000 W

Mounting dimensions

Ø15 3/8″cutout Ø14 3/16″mounting depth 11 1/8″magnet Ø≈ 9 3/16″
Cutout diameter14 3/16″
Mounting depth11 1/8″
Overall diameter15 3/8″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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 Pride 15″ models