CT Sounds STRATO-12 D4

12″ subwoofer · dual 4 Ω · 1,250 W RMS

Fs 31.8 HzQts 0.54Vas 0.79 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 1,250 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 volume0.72 ft³ (20.5 L)
Qtc0.79
Fc46 Hz
F3 (−3 dB, no cabin gain)44 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume2.08 ft³ (59 L)
Tuning (Fb)26 Hz
Portslot 1 15/16 × 14 5/16″, 49 1/8″ long
Port velocity at 1,250 W90 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 3/8″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.8 Hz
Qts0.54
Qes0.597
Qms6.12
Vas0.79 ft³
Re (one coil)3.32 Ω
Sd73.1 in²
Xmax0.59″
Vd43.1 in³ calc.
Mms352 g calc.
BL19.8 T·m calc.
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.8 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,250 W

Mounting dimensions

Ø12 15/16″cutout Ø11 5/16″mounting depth 7 3/16″magnet Ø≈ 7 3/8″
Cutout diameter11 5/16″
Mounting depth7 3/16″
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