Sundown Audio Uv2-12 D4

12″ subwoofer · dual 4 Ω · 2,000 W RMS

Fs 41.9 HzQts 0.52Vas 0.52 ft³Xmax 1.18″

Recommended box

For a sedan, one sub, 2,000 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 volume0.79 ft³ (22.5 L)
Qtc0.67
Fc54 Hz
F3 (−3 dB, no cabin gain)59 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 11″
Open sealed box in designer

Ported

Net volume1.52 ft³ (43 L)
Tuning (Fb)32 Hz
Portround port Ø2 1/2″, 6 3/4″ long
Port velocity at 2,000 W612 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)22 1/2″ × 15 3/4″ × 10 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs41.9 Hz
Qts0.52
Qes0.58
Qms4.9
Vas0.52 ft³
Re (one coil)3.03 Ω
Sd78.6 in²
Xmax1.18″
Vd92.9 in³ calc.
Mms357 g calc.
BL22.1 T·m calc.
EBP72 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.7 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power2,000 W

Mounting dimensions

Ø12 13/16″cutout Ø11 3/16″mounting depth 8 7/16″magnet Ø9 11/16″
Cutout diameter11 3/16″
Mounting depth8 7/16″
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: 78.6 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 12″ models