CT Sounds BIO-8 D2

8″ subwoofer · dual 2 Ω · 300 W RMS

Fs 47.2 HzQts 0.57Vas 0.29 ft³Xmax 0.26″

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)
Qtc0.80
Fc65 Hz
F3 (−3 dB, no cabin gain)61 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume0.88 ft³ (25 L)
Tuning (Fb)36 Hz
Port2 round ports Ø2 1/2″, 21 7/16″ long
Port velocity at 300 W97 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)28 3/16″ × 15 3/4″ × 6 5/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs47.2 Hz
Qts0.57
Qes0.631
Qms6.41
Vas0.29 ft³
Re (one coil)1.9 Ω
Sd31.2 in²
Xmax0.26″
Vd8 in³ calc.
Mms79 g calc.
BL8.4 T·m calc.
EBP75 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.4 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power300 W

Mounting dimensions

Ø8 3/8″cutout Ø7 3/16″mounting depth 3 13/16″magnet Ø≈ 4 11/16″
Cutout diameter7 3/16″
Mounting depth3 13/16″
Overall diameter8 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 8″ models