Sundown Audio SA Classic 15 D2

15″ subwoofer · dual 2 Ω · 1,000 W RMS

Fs 37.8 HzQts 0.46Vas 1.96 ft³Xmax 0.75″

Recommended box

For a sedan, one sub, 1,000 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 volume1.20 ft³ (34 L)
Qtc0.75
Fc61 Hz
F3 (−3 dB, no cabin gain)61 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume3.18 ft³ (90 L)
Tuning (Fb)35 Hz
Portslot 2 3/4 × 16 11/16″, 26″ long
Port velocity at 1,000 W65 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 15 13/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37.8 Hz
Qts0.46
Qes0.55
Qms2.86
Vas1.96 ft³
Re (one coil)2.15 Ω
Sd130 in²
Xmax0.75″
Vd97.3 in³ calc.
Mms319 g calc.
BL17.2 T·m calc.
EBP69 — sealed or ported calc.
Sensitivity, 1 W / 1 m89.4 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power1,000 W

Mounting dimensions

Ø15 1/2″cutout Ø14″mounting depth 7 11/16″magnet Ø7 13/16″
Cutout diameter14″
Mounting depth7 11/16″
Overall diameter15 1/2″
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: 130 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