CT Sounds TROPO-6-5 D4

6.5″ subwoofer · dual 4 Ω · 200 W RMS

Fs 61.5 HzQts 0.66Vas 0.11 ft³Xmax 0.28″

Recommended box

For a sedan, one sub, 200 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 volume0.21 ft³ (6 L)
Qtc0.81
Fc76 Hz
F3 (−3 dB, no cabin gain)70 Hz
Example box (outside)9 1/16″ × 9 1/16″ × 8 3/16″
Open sealed box in designer

Ported

Net volume0.49 ft³ (14 L)
Tuning (Fb)49 Hz
Portround port Ø2 1/2″, 9 3/8″ long
Port velocity at 200 W141 ft/s
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)13 13/16″ × 15 3/4″ × 6 11/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs61.5 Hz
Qts0.66
Qes0.745
Qms5.54
Vas0.11 ft³
Re (one coil)3.38 Ω
Sd22.2 in²
Xmax0.28″
Vd6.1 in³ calc.
Mms60 g calc.
BL10.3 T·m calc.
EBP83 — sealed or ported calc.
Sensitivity, 1 W / 1 m82 dB calc.

General

Size6.5″
Voice coilsdual 4 Ω
RMS power200 W

Mounting dimensions

Ø6 15/16″cutout Ø5 13/16″mounting depth 4 1/4″magnet Ø≈ 3 13/16″
Cutout diameter5 13/16″
Mounting depth4 1/4″
Overall diameter6 15/16″

“≈” 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 6.5″ models