CT Sounds OZONE-12 D4

12″ subwoofer · dual 4 Ω · 800 W RMS

Fs 39.1 HzQts 0.67Vas 0.70 ft³Xmax 0.59″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 800 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 volume1.38 ft³ (39 L)
Qtc0.82
Fc48 Hz
F3 (−3 dB, no cabin gain)44 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 17 3/16″
Open sealed box in designer

Ported

Net volume2.83 ft³ (80 L)
Tuning (Fb)28 Hz
Portslot 2 15/16 × 14 5/16″, 45 11/16″ long
Port velocity at 800 W61 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 18 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.1 Hz
Qts0.67
Qes0.745
Qms6.75
Vas0.70 ft³
Re (one coil)3.2 Ω
Sd73.1 in²
Xmax0.59″
Vd43.1 in³ calc.
Mms264 g calc.
BL16.7 T·m calc.
EBP52 — sealed or ported calc.
Sensitivity, 1 W / 1 m84 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power800 W

Mounting dimensions

Ø12 13/16″cutout Ø10 15/16″mounting depth 6 3/8″magnet Ø≈ 7 1/8″
Cutout diameter10 15/16″
Mounting depth6 3/8″
Overall diameter12 13/16″

“≈” 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