CT Sounds TROPO-15 D2

15″ subwoofer · dual 2 Ω

Fs 33.7 HzQts 0.57Vas 3.40 ft³Xmax 0.49″

Recommended box

For a sedan, one sub, 300 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 volume2.83 ft³ (80 L)
Qtc0.84
Fc50 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 11 3/4″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)34 Hz
Portslot 1 3/4 × 16 11/16″, 9 3/4″ long
Port velocity at 300 W63 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 19 5/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33.7 Hz
Qts0.57
Qes0.67
Qms3.62
Vas3.40 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax0.49″
EBP50 — sealed or ported calc.
Sensitivity, 1 W / 1 m89.4 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power—

Mounting dimensions

Ø15 3/8″cutout Ø14 3/16″mounting depth 7 3/8″magnet Ø≈ 9 1/4″
Cutout diameter14 3/16″
Mounting depth7 3/8″
Overall diameter15 3/8″

“≈” 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 15″ models