CT Sounds THERMO-12 D4

12″ subwoofer · dual 4 Ω · 1,500 W RMS

Fs 35.2 HzQts 0.47Vas 0.52 ft³Xmax 0.73″

Recommended box

For a sedan, one sub, 1,500 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 volume0.83 ft³ (23.5 L)
Qtc0.59
Fc45 Hz
F3 (−3 dB, no cabin gain)57 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 10 3/4″
Open sealed box in designer

Ported

Net volume1.41 ft³ (40 L)
Tuning (Fb)27 Hz
Port2 round ports Ø2 1/2″, 24 1/16″ long
Port velocity at 1,500 W241 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)23 1/4″ × 15 3/4″ × 10 13/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35.2 Hz
Qts0.47
Qes0.495
Qms7.9
Vas0.52 ft³
Re (one coil)3.2 Ω
Sd73 in²
Xmax0.73″
Vd53.2 in³ calc.
Mms436 g calc.
BL25 T·m calc.
EBP71 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.1 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,500 W

Mounting dimensions

Ø12 15/16″cutout Ø11 5/16″mounting depth 8 1/4″magnet Ø≈ 7 3/8″
Cutout diameter11 5/16″
Mounting depth8 1/4″
Overall diameter12 15/16″

“≈” 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 CT Sounds 12″ models