CT Sounds TROPO-XL-12 D4

12″ subwoofer · dual 4 Ω · 1,000 W RMS

Fs 37.5 HzQts 0.65Vas 0.88 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 1,000 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 volume1.77 ft³ (50 L)
Qtc0.80
Fc46 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 21 5/16″
Open sealed box in designer

Ported

Net volume3.18 ft³ (90 L)
Tuning (Fb)28 Hz
Portslot 3 3/8 × 14 5/16″, 45 3/4″ long
Port velocity at 1,000 W63 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 20 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37.5 Hz
Qts0.65
Qes0.729
Qms6.32
Vas0.88 ft³
Re (one coil)3.4 Ω
Sd82.3 in²
Xmax0.55″
Vd45.4 in³ calc.
Mms288 g calc.
BL17.8 T·m calc.
EBP51 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.6 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,000 W

Mounting dimensions

Ø12 13/16″cutout Ø11″mounting depth 7″magnet Ø≈ 7 1/8″
Cutout diameter11″
Mounting depth7″
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