Sundown Audio Ev4-12 D4

12″ subwoofer · dual 4 Ω · 750 W RMS

Fs 36.6 HzQts 0.48Vas 1.09 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 750 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 volume0.71 ft³ (20 L)
Qtc0.76
Fc58 Hz
F3 (−3 dB, no cabin gain)58 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.94 ft³ (55 L)
Tuning (Fb)33 Hz
Portslot 2 3/8 × 14 5/16″, 38″ long
Port velocity at 750 W61 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 3/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.6 Hz
Qts0.48
Qes0.53
Qms4.58
Vas1.09 ft³
Re (one coil)3.05 Ω
Sd78.7 in²
Xmax0.55″
Vd43.4 in³ calc.
Mms224 g calc.
BL17.2 T·m calc.
EBP69 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.6 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power750 W

Mounting dimensions

Ø12 1/4″cutout Ø11 1/8″mounting depth 6 1/2″magnet Ø6 3/8″
Cutout diameter11 1/8″
Mounting depth6 1/2″
Overall diameter12 1/4″
Magnet diameter6 3/8″

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