CT Sounds TROPO-15 D4

15″ subwoofer · dual 4 Ω

Fs 36.1 HzQts 0.66Vas 2.91 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)
Qtc0.93
Fc51 Hz
F3 (−3 dB, no cabin gain)44 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)36 Hz
Portslot 1 3/4 × 16 11/16″, 8 3/16″ long
Port velocity at 300 W64 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 19 3/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.1 Hz
Qts0.66
Qes0.8
Qms3.62
Vas2.91 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 124 in²
Xmax0.49″
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m88.8 dB calc.

General

Size15″
Voice coilsdual 4 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