CT Sounds TROPO-8 D4

8″ subwoofer · dual 4 Ω · 400 W RMS

Fs 42.6 HzQts 0.50Vas 0.29 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)
Qtc0.71
Fc61 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 8 1/2″
Open sealed box in designer

Ported

Net volume0.60 ft³ (17 L)
Tuning (Fb)40 Hz
Portround port Ø2 1/2″, 12 1/16″ long
Port velocity at 400 W184 ft/s
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)15 5/16″ × 15 3/4″ × 7 5/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs42.6 Hz
Qts0.50
Qes0.582
Qms3.47
Vas0.29 ft³
Re (one coil)3.2 Ω
Sd29.2 in²
Xmax0.33″
Vd9.8 in³ calc.
Mms86 g calc.
BL11.3 T·m calc.
EBP73 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.4 dB calc.

General

Size8″
Voice coilsdual 4 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