Sundown Audio SML-12 D2

12″ subwoofer · dual 2 Ω · 600 W RMS

Fs 34.9 HzQts 0.39Vas 1.38 ft³Xmax 0.43″

Recommended box

For a sedan, one sub, 600 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 volume0.71 ft³ (20 L)
Qtc0.68
Fc60 Hz
F3 (−3 dB, no cabin gain)66 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 10 5/8″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)37 Hz
Portslot 1 3/4 × 14 5/16″, 30 1/16″ long
Port velocity at 600 W61 ft/s
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.9 Hz
Qts0.39
Qes0.456
Qms2.86
Vas1.38 ft³
Re (one coil)1.83 Ω
Sd76.2 in²
Xmax0.43″
Vd33 in³ calc.
Mms182 g calc.
BL12.7 T·m calc.
EBP77 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.6 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power600 W

Mounting dimensions

Ø12 5/8″cutout Ø10 3/4″mounting depth 4 7/16″magnet Ø6 1/8″
Cutout diameter10 3/4″
Mounting depth4 7/16″
Overall diameter12 5/8″
Magnet diameter6 1/8″

The spec sheet's Sd of 114 in² is the area of a 12″ circle, not the cone's radiating area — not used.

Cone area (Sd) calculated from Fs, Vas and Mms: 76.2 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 12″ models