Sundown Audio SA Classic 12 D4

12″ subwoofer · dual 4 Ω · 1,000 W RMS

Fs 34 HzQts 0.50Vas 0.87 ft³Xmax 0.75″

Recommended box

For a sedan, one sub, 1,000 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 volume0.60 ft³ (17 L)
Qtc0.78
Fc53 Hz
F3 (−3 dB, no cabin gain)51 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 8 15/16″
Open sealed box in designer

Ported

Net volume1.77 ft³ (50 L)
Tuning (Fb)30 Hz
Portslot 2 3/16 × 14 5/16″, 47 5/8″ long
Port velocity at 1,000 W71 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34 Hz
Qts0.50
Qes0.55
Qms5.15
Vas0.87 ft³
Re (one coil)3.54 Ω
Sd67.1 in²
Xmax0.75″
Vd50.2 in³ calc.
Mms237 g calc.
BL18 T·m calc.
EBP62 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.4 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,000 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/8″mounting depth 6 1/2″magnet Ø7 3/8″
Cutout diameter11 1/8″
Mounting depth6 1/2″
Overall diameter12 5/8″
Magnet diameter7 3/8″

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: 67.1 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