Avatar SST-312 D2

12″ subwoofer · dual 2 Ω · 1,000 W RMS

Fs 38.1 HzQts 0.50Vas 1.03 ft³Xmax 0.59″

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 volume0.71 ft³ (20 L)
Qtc0.78
Fc60 Hz
F3 (−3 dB, no cabin gain)57 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume2.12 ft³ (60 L)
Tuning (Fb)33 Hz
Portslot 2 3/4 × 14 5/16″, 40 9/16″ long
Port velocity at 1,000 W65 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs38.1 Hz
Qts0.50
Qes0.545
Qms6
Vas1.03 ft³
Re (one coil)1.8 Ω
Sd≈ 76 in²
Xmax0.59″
EBP70 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.7 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,000 W

Mounting dimensions

Ø12 9/16″cutout Ø11 1/8″mounting depth 5 7/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth5 7/8″
Overall diameter12 9/16″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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 Avatar 12″ models