CT Sounds TROPO-12 D4

12″ subwoofer · dual 4 Ω · 650 W RMS

Fs 34.1 HzQts 0.59Vas 1.55 ft³Xmax 0.43″

Recommended box

For a sedan, one sub, 650 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 volume1.87 ft³ (53 L)
Qtc0.80
Fc46 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/8″
Open sealed box in designer

Ported

Net volume3.18 ft³ (90 L)
Tuning (Fb)31 Hz
Portslot 2 9/16 × 14 5/16″, 27 1/16″ long
Port velocity at 650 W63 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 3/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.1 Hz
Qts0.59
Qes0.662
Qms5.79
Vas1.55 ft³
Re (one coil)3.6 Ω
Sd82.3 in²
Xmax0.43″
Vd35.6 in³ calc.
Mms199 g calc.
BL15.2 T·m calc.
EBP52 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power650 W

Mounting dimensions

Ø12 13/16″cutout Ø11″mounting depth 6 1/4″magnet Ø≈ 7 1/8″
Cutout diameter11″
Mounting depth6 1/4″
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