Sundown Audio SML-10 D2

10″ subwoofer · dual 2 Ω · 600 W RMS

Fs 35.2 HzQts 0.69Vas 0.84 ft³Xmax 0.55″
The published specs don’t add up:

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 volume1.24 ft³ (35 L)
Qtc0.90
Fc46 Hz
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 6 5/8″
Open sealed box in designer

Ported

Net volume2.08 ft³ (59 L)
Tuning (Fb)31 Hz
Portslot 1 3/4 × 14 5/16″, 29 3/4″ long
Port velocity at 600 W66 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 3/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35.2 Hz
Qts0.69
Qes0.931
Qms2.7
Vas0.84 ft³
Re (one coil)1.83 Ω
Sd53.8 in²
Xmax0.55″
Vd29.6 in³ calc.
Mms147 g calc.
BL8 T·m calc.
EBP38 — suits sealed calc.
Sensitivity, 1 W / 1 m82.5 dB calc.

General

Size10″
Voice coilsdual 2 Ω
RMS power600 W

Mounting dimensions

Ø10 7/8″cutout Ø9 1/8″mounting depth 3 3/4″magnet Ø6 1/8″
Cutout diameter9 1/8″
Mounting depth3 3/4″
Overall diameter10 7/8″
Magnet diameter6 1/8″

The spec sheet's Sd of 78.5 in² is the area of a 10″ circle, not the cone's radiating area — not used.

Cone area (Sd) calculated from Fs, Vas and Mms: 53.8 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 10″ models