Sundown Audio SDv4-12 D2

12″ subwoofer · dual 2 Ω · 600 W RMS

Fs 26 HzQts 0.56Vas 2.24 ft³Xmax 0.57″

Recommended box

For a sedan, one sub, 600 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 volume1.80 ft³ (51 L)
Qtc0.83
Fc39 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.04 ft³ (86 L)
Tuning (Fb)28 Hz
Portslot 2 3/16 × 14 5/16″, 30 1/4″ long
Port velocity at 600 W64 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 3/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26 Hz
Qts0.56
Qes0.619
Qms5.43
Vas2.24 ft³
Re (one coil)1.97 Ω
Sd78.6 in²
Xmax0.57″
Vd44.9 in³ calc.
Mms215 g calc.
BL10.6 T·m calc.
EBP42 — suits sealed calc.
Sensitivity, 1 W / 1 m84.6 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power600 W

Mounting dimensions

Ø12 1/2″cutout Ø10 1/2″mounting depth 4 7/8″magnet Ø3 15/16″
Cutout diameter10 1/2″
Mounting depth4 7/8″
Overall diameter12 1/2″
Magnet diameter3 15/16″

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