CT Sounds HYDRO-8 D2

8″ subwoofer · dual 2 Ω · 300 W RMS

Fs 46.2 HzQts 0.53Vas 0.36 ft³Xmax 0.31″

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 volume0.32 ft³ (9 L)
Qtc0.78
Fc68 Hz
F3 (−3 dB, no cabin gain)65 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 5/8″
Open sealed box in designer

Ported

Net volume0.88 ft³ (25 L)
Tuning (Fb)37 Hz
Portround port Ø3″, 13 3/8″ long
Port velocity at 300 W136 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)14 1/2″ × 15 3/4″ × 10 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs46.2 Hz
Qts0.53
Qes0.577
Qms6.55
Vas0.36 ft³
Re (one coil)1.95 Ω
Sd35.2 in²
Xmax0.31″
Vd11.1 in³ calc.
Mms84 g calc.
BL9.1 T·m calc.
EBP80 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.5 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power300 W

Mounting dimensions

Ø8 3/4″cutout Ø7 1/2″mounting depth 3 1/4″magnet Ø≈ 4 7/8″
Cutout diameter7 1/2″
Mounting depth3 1/4″
Overall diameter8 3/4″

“≈” 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