Sundown Audio LCSv2-10 D4

10″ subwoofer · dual 4 Ω · 500 W RMS

Fs 34.8 HzQts 0.51Vas 1.63 ft³Xmax 0.55″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 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 volume1.13 ft³ (32 L)
Qtc0.80
Fc54 Hz
F3 (−3 dB, no cabin gain)51 Hz
Example box (outside)12 5/8″ × 12 5/8″ × 17 15/16″
Open sealed box in designer

Ported

Net volume2.05 ft³ (58 L)
Tuning (Fb)36 Hz
Portslot 1 3/4 × 14 5/16″, 21 3/8″ long
Port velocity at 500 W65 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.8 Hz
Qts0.51
Qes0.567
Qms5.33
Vas1.63 ft³
Re (one coil)3.6 Ω
Sd≈ 52.7 in²
Xmax0.55″
EBP61 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.4 dB calc.

General

Size10″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø10 1/4″cutout Ø9 3/8″mounting depth 5 1/4″magnet Ø5 3/4″
Cutout diameter9 3/8″
Mounting depth5 1/4″
Overall diameter10 1/4″
Magnet diameter5 3/4″

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

“≈” 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