Avatar SST-15

15″ subwoofer · 4 Ω · 300 W RMS

Fs 32.6 HzQts 0.71Vas 3.95 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 volume2.83 ft³ (80 L)
Qtc1.10
Fc50 Hz
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)37 Hz
Portslot 1 3/4 × 16 5/16″, 7 5/16″ long
Port velocity at 300 W63 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 19 1/2″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.6 Hz
Qts0.71
Qes0.803
Qms6
Vas3.95 ft³
Re2.8 Ω
Sd≈ 124 in²
Xmax0.55″
EBP41 — suits sealed calc.
Sensitivity, 1 W / 1 m88.8 dB calc.

General

Size15″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø15 3/8″cutout Ø13 3/4″mounting depth 7 1/8″magnet Ø≈ 8 15/16″
Cutout diameter13 3/4″
Mounting depth7 1/8″
Overall diameter15 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 15″ models