Sundown Audio SDv4-12 D4

12″ subwoofer · dual 4 Ω · 600 W RMS

Fs 26.8 HzQts 0.65Vas 2.27 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)
Qtc0.98
Fc40 Hz
F3 (−3 dB, no cabin gain)33 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)30 Hz
Portslot 2 3/16 × 14 5/16″, 25 3/4″ long
Port velocity at 600 W63 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 5/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26.8 Hz
Qts0.65
Qes0.737
Qms5.51
Vas2.27 ft³
Re (one coil)3.51 Ω
Sd78.7 in²
Xmax0.57″
Vd44.9 in³ calc.
Mms201 g calc.
BL12.7 T·m calc.
EBP36 — suits sealed calc.
Sensitivity, 1 W / 1 m84.2 dB calc.

General

Size12″
Voice coilsdual 4 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: 78.7 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