Sundown Audio Xv3-12 D2

12″ subwoofer · dual 2 Ω · 2,500 W RMS

Fs 36.1 HzQts 0.49Vas 0.56 ft³Xmax 1.18″

Recommended box

For a sedan, one sub, 2,500 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 volume0.90 ft³ (25.5 L)
Qtc0.62
Fc46 Hz
F3 (−3 dB, no cabin gain)55 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 12 1/8″
Open sealed box in designer

Ported

Net volume1.34 ft³ (38 L)
Tuning (Fb)29 Hz
Portround port Ø2 1/2″, 9 15/16″ long
Port velocity at 2,500 W615 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)18 3/16″ × 15 3/4″ × 12 3/16″
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
Qts0.49
Qes0.54
Qms4.82
Vas0.56 ft³
Re (one coil)1.63 Ω
Sd71 in²
Xmax1.18″
Vd83.8 in³ calc.
Mms367 g calc.
BL15.8 T·m calc.
EBP67 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.4 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power2,500 W

Mounting dimensions

Ø12 11/16″cutout Ø11 1/8″mounting depth 9 11/16″magnet Ø9 11/16″
Cutout diameter11 1/8″
Mounting depth9 11/16″
Overall diameter12 11/16″
Magnet diameter9 11/16″

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: 71 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