Avatar SST-12

12″ subwoofer · 4 Ω · 300 W RMS

Fs 37.4 HzQts 0.51Vas 1.68 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 300 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 volume1.17 ft³ (33 L)
Qtc0.80
Fc58 Hz
F3 (−3 dB, no cabin gain)55 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 15 13/16″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)34 Hz
Portslot 1 3/4 × 14 5/16″, 15 7/8″ long
Port velocity at 300 W64 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 13/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37.4 Hz
Qts0.51
Qes0.56
Qms6
Vas1.68 ft³
Re2.8 Ω
Sd≈ 76 in²
Xmax0.55″
EBP67 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø12 3/8″cutout Ø10 13/16″mounting depth 6 1/16″magnet Ø≈ 7″
Cutout diameter10 13/16″
Mounting depth6 1/16″
Overall diameter12 3/8″

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