Sundown Audio SML-10 D4

10″ subwoofer · dual 4 Ω · 600 W RMS

Fs 36.1 HzQts 0.40Vas 0.66 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 volume0.46 ft³ (13 L)
Qtc0.63
Fc57 Hz
F3 (−3 dB, no cabin gain)68 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 9 3/16″
Open sealed box in designer

Ported

Net volume0.95 ft³ (27 L)
Tuning (Fb)34 Hz
Port2 round ports Ø2 1/2″, 22 5/16″ long
Port velocity at 600 W128 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)30 13/16″ × 15 3/4″ × 6 5/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.1 Hz
Qts0.40
Qes0.469
Qms2.77
Vas0.66 ft³
Re (one coil)3.43 Ω
Sd49.2 in²
Xmax0.55″
Vd27.1 in³ calc.
Mms147 g calc.
BL15.6 T·m calc.
EBP77 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.8 dB calc.

General

Size10″
Voice coilsdual 4 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: 49.2 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 10″ models