CT Sounds TROPO-8 D2

8″ subwoofer · dual 2 Ω · 400 W RMS

Fs 45 HzQts 0.46Vas 0.25 ft³Xmax 0.33″

Recommended box

For a sedan, one sub, 400 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 volume0.28 ft³ (8 L)
Qtc0.63
Fc62 Hz
F3 (−3 dB, no cabin gain)73 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 8 1/2″
Open sealed box in designer

Ported

Net volume0.57 ft³ (16 L)
Tuning (Fb)44 Hz
Portround port Ø2 1/2″, 10 5/16″ long
Port velocity at 400 W195 ft/s
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)14 7/16″ × 15 3/4″ × 7 5/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs45 Hz
Qts0.46
Qes0.532
Qms3.37
Vas0.25 ft³
Re (one coil)2 Ω
Sd29.2 in²
Xmax0.33″
Vd9.8 in³ calc.
Mms91 g calc.
BL9.8 T·m calc.
EBP85 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.8 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power400 W

Mounting dimensions

Ø8 7/16″cutout Ø7 3/16″mounting depth 4 13/16″magnet Ø≈ 4 11/16″
Cutout diameter7 3/16″
Mounting depth4 13/16″
Overall diameter8 7/16″

“≈” 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 8″ models