Sundown Audio SAv3-15 D4

15″ subwoofer · dual 4 Ω · 1,500 W RMS

Fs 35 HzQts 0.47Vas 1.78 ft³Xmax 0.87″

Recommended box

For a sedan, one sub, 1,500 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 volume1.27 ft³ (36 L)
Qtc0.73
Fc54 Hz
F3 (−3 dB, no cabin gain)55 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 11 5/16″
Open sealed box in designer

Ported

Net volume3.11 ft³ (88 L)
Tuning (Fb)32 Hz
Portslot 3 1/8 × 16 11/16″, 38 3/16″ long
Port velocity at 1,500 W65 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 17 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.47
Qes0.569
Qms2.79
Vas1.78 ft³
Re (one coil)3.03 Ω
Sd138.3 in²
Xmax0.87″
Vd119.8 in³ calc.
Mms463 g calc.
BL23.3 T·m calc.
EBP62 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.8 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power1,500 W

Mounting dimensions

Ø15 9/16″cutout Ø14 1/8″mounting depth 8 11/16″magnet Ø7 13/16″
Cutout diameter14 1/8″
Mounting depth8 11/16″
Overall diameter15 9/16″
Magnet diameter7 13/16″

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: 138.3 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