Dayton Audio SD215A-88

8″ subwoofer · dual 8 Ω · 80 W RMS

Fs 31 HzQts 0.39Vas 1.35 ft³Xmax 0.24″

Recommended box

For a sedan, one sub, 80 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 volume0.42 ft³ (12 L)
Qtc0.80
Fc63 Hz
F3 (−3 dB, no cabin gain)60 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 11 5/8″
Open sealed box in designer

Ported

Net volume1.24 ft³ (35 L)
Tuning (Fb)34 Hz
Portslot 1 9/16 × 14 5/16″, 38 5/16″ long
Port velocity at 80 W22 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31 Hz
Qts0.39
Qes0.45
Qms3.1
Vas1.35 ft³
Re (one coil)6.4 Ω
Sd32.3 in²
Xmax0.24″
Vd7.6 in³ calc.
Mms43 g calc.
BL10.9 T·m calc.
EBP69 — sealed or ported calc.
Sensitivity, 1 W / 1 m86 dB calc.

General

Size8″
Voice coilsdual 8 Ω
RMS power80 W

Mounting dimensions

Ø8 1/2″cutout Ø7 1/16″mounting depth 3 3/4″magnet Ø≈ 4 5/8″
Cutout diameter7 1/16″
Mounting depth3 3/4″
Overall diameter8 1/2″

“≈” 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 Dayton Audio 8″ models