Sundown Audio Ev4-15 D4

15″ subwoofer · dual 4 Ω · 750 W RMS

Fs 31.3 HzQts 0.54Vas 3.02 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 volume2.58 ft³ (73 L)
Qtc0.80
Fc46 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 11 1/8″
Open sealed box in designer

Ported

Net volume4.94 ft³ (140 L)
Tuning (Fb)30 Hz
Portslot 2 15/16 × 16 5/16″, 23 3/16″ long
Port velocity at 750 W62 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 22 1/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.3 Hz
Qts0.54
Qes0.62
Qms4.32
Vas3.02 ft³
Re (one coil)3.05 Ω
Sd127.9 in²
Xmax0.55″
Vd70.5 in³ calc.
Mms291 g calc.
BL16.8 T·m calc.
EBP50 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.3 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power750 W

Mounting dimensions

Ø15 1/8″cutout Ø13 7/8″mounting depth 7 1/4″magnet Ø6 3/8″
Cutout diameter13 7/8″
Mounting depth7 1/4″
Overall diameter15 1/8″
Magnet diameter6 3/8″

The spec sheet's Sd of 177 in² is the area of a 15″ circle, not the cone's radiating area — not used.

Cone area (Sd) calculated from Fs, Vas and Mms: 127.9 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 15″ models