Sundown Audio SAv2-15 D4

15″ subwoofer · dual 4 Ω · 1,250 W RMS

Fs 37.4 HzQts 0.62Vas 1.60 ft³Xmax 0.75″

Recommended box

For a sedan, one sub, 1,250 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 volume2.40 ft³ (68 L)
Qtc0.80
Fc48 Hz
F3 (−3 dB, no cabin gain)45 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 19″
Open sealed box in designer

Ported

Net volume5.26 ft³ (149 L)
Tuning (Fb)29 Hz
Portslot 4 1/8 × 16 11/16″, 34 13/16″ long
Port velocity at 1,250 W63 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 25 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37.4 Hz
Qts0.62
Qes0.696
Qms5.71
Vas1.60 ft³
Re (one coil)2.92 Ω
Sd135.5 in²
Xmax0.75″
Vd101.4 in³ calc.
Mms432 g calc.
BL20.6 T·m calc.
EBP54 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.3 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power1,250 W

Mounting dimensions

Ø15 9/16″cutout Ø14″mounting depth 9″magnet Ø9 11/16″
Cutout diameter14″
Mounting depth9″
Overall diameter15 9/16″
Magnet diameter9 11/16″

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: 135.5 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