Sundown Audio Uv1-12 D2

12″ subwoofer · dual 2 Ω · 1,500 W RMS

Fs 42.2 HzQts 0.27Vas 0.63 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 volume0.72 ft³ (20.5 L)
Qtc0.37
Fc58 Hz
F3 (−3 dB, no cabin gain)137 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/4″
Open sealed box in designer

Ported

Net volume1.52 ft³ (43 L)
Tuning (Fb)31 Hz
Portround port Ø3″, 10 11/16″ long
Port velocity at 1,500 W384 ft/s
F3 (−3 dB, no cabin gain)126 Hz
Example box (outside)24 1/4″ × 15 3/4″ × 10 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs42.2 Hz
Qts0.27
Qes0.3
Qms2.67
Vas0.63 ft³
Re (one coil)1.9 Ω
Sd78.7 in²
Xmax1.18″
Vd93 in³ calc.
Mms290 g calc.
BL22.1 T·m calc.
EBP141 — suits ported calc.
Sensitivity, 1 W / 1 m88.5 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,500 W

Mounting dimensions

Ø12 13/16″cutout Ø11″mounting depth 7 3/4″magnet Ø9 11/16″
Cutout diameter11″
Mounting depth7 3/4″
Overall diameter12 13/16″
Magnet diameter9 11/16″

The spec sheet's Sd of 114 in² is the area of a 12″ circle, not the cone's radiating area — not used.

Cone area (Sd) calculated from Fs, Vas and Mms: 78.7 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 12″ models