Sundown Audio Ev4-15 D2

15″ subwoofer · dual 2 Ω · 750 W RMS

Fs 32.2 HzQts 0.48Vas 2.65 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 volume1.45 ft³ (41 L)
Qtc0.80
Fc54 Hz
F3 (−3 dB, no cabin gain)51 Hz
Example box (outside)16 15/16″ × 16 15/16″ × 13 1/16″
Open sealed box in designer

Ported

Net volume4.77 ft³ (135 L)
Tuning (Fb)29 Hz
Portslot 2 15/16 × 16 5/16″, 26 3/8″ long
Port velocity at 750 W63 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 21 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.2 Hz
Qts0.48
Qes0.53
Qms4.79
Vas2.65 ft³
Re (one coil)2 Ω
Sd127.7 in²
Xmax0.55″
Vd70.4 in³ calc.
Mms313 g calc.
BL15.5 T·m calc.
EBP61 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.8 dB calc.

General

Size15″
Voice coilsdual 2 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: 127.7 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 15″ models