Sundown Audio SAv2-12 D2

12″ subwoofer · dual 2 Ω · 1,250 W RMS

Fs 38.9 HzQts 0.46Vas 0.93 ft³Xmax 0.75″

Recommended box

For a sedan, one sub, 1,250 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 volume0.74 ft³ (21 L)
Qtc0.68
Fc58 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 7/16″
Open sealed box in designer

Ported

Net volume1.59 ft³ (45 L)
Tuning (Fb)35 Hz
Portslot 2 9/16 × 14 5/16″, 45 3/8″ long
Port velocity at 1,250 W67 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs38.9 Hz
Qts0.46
Qes0.507
Qms4.51
Vas0.93 ft³
Re (one coil)1.96 Ω
Sd82.6 in²
Xmax0.75″
Vd61.8 in³ calc.
Mms257 g calc.
BL15.6 T·m calc.
EBP77 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.8 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,250 W

Mounting dimensions

Ø12 13/16″cutout Ø11″mounting depth 7 1/2″magnet Ø9 11/16″
Cutout diameter11″
Mounting depth7 1/2″
Overall diameter12 13/16″
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: 82.6 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