Sundown Audio Uv1-15 D4

15″ subwoofer · dual 4 Ω · 1,500 W RMS

Fs 34.9 HzQts 0.35Vas 2.26 ft³Xmax 1.18″

Recommended box

For a sedan, one sub, 1,500 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 volume1.31 ft³ (37 L)
Qtc0.58
Fc58 Hz
F3 (−3 dB, no cabin gain)76 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 11 9/16″
Open sealed box in designer

Ported

Net volume2.61 ft³ (74 L)
Tuning (Fb)35 Hz
Portslot 3 1/8 × 16 11/16″, 37 15/16″ long
Port velocity at 1,500 W65 ft/s
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 15 11/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.9 Hz
Qts0.35
Qes0.39
Qms3.48
Vas2.26 ft³
Re (one coil)3.05 Ω
Sd135.6 in²
Xmax1.18″
Vd160.2 in³ calc.
Mms353 g calc.
BL24.6 T·m calc.
EBP89 — sealed or ported calc.
Sensitivity, 1 W / 1 m90.4 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power1,500 W

Mounting dimensions

Ø15 9/16″cutout Ø14″mounting depth 9 1/16″magnet Ø9 11/16″
Cutout diameter14″
Mounting depth9 1/16″
Overall diameter15 9/16″
Magnet diameter9 11/16″

The spec sheet's Sd of 177 in² is the area of a 15″ circle, not the cone's radiating area — not used.

Cone area (Sd) calculated from Fs, Vas and Mms: 135.6 in².

“≈” 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 Sundown Audio 15″ models