Treo SS12.22

12″ subwoofer · dual 2 Ω · 500 W RMS

Fs 23.7 HzQts 0.53Vas 1.57 ft³Xmax 1.06″

Recommended box

For a sedan, one sub, 500 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 volume1.20 ft³ (34 L)
Qtc0.80
Fc36 Hz
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 15 5/16″
Open sealed box in designer

Ported

Net volume2.51 ft³ (71 L)
Tuning (Fb)25 Hz
Portslot 1 3/4 × 14 5/16″, 39 1/8″ long
Port velocity at 500 W65 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs23.7 Hz
Qts0.53
Qes0.572
Qms6.9
Vas1.57 ft³
Re (one coil)1.9 Ω
Sd64.4 in²
Xmax1.06″
Vd68.5 in³ calc.
Mms248 g calc.
BL11.1 T·m calc.
EBP41 — suits sealed calc.
Sensitivity, 1 W / 1 m82.1 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/8″mounting depth 6 3/8″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth6 3/8″
Overall diameter12 5/8″

Judging by its value, the published Re is for both coils in series — converted to per coil.

“≈” 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 Treo 12″ models