Dayton Audio SD315A-88

12″ subwoofer · dual 8 Ω · 120 W RMS

Fs 24.2 HzQts 0.33Vas 5.36 ft³Xmax 0.28″

Recommended box

For a sedan, one sub, 120 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 volume1.13 ft³ (32 L)
Qtc0.80
Fc58 Hz
F3 (−3 dB, no cabin gain)56 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 15 3/8″
Open sealed box in designer

Ported

Net volume3.14 ft³ (89 L)
Tuning (Fb)31 Hz
Portslot 1 9/16 × 14 5/16″, 16 1/16″ long
Port velocity at 120 W40 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 9/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs24.2 Hz
Qts0.33
Qes0.37
Qms3.54
Vas5.36 ft³
Re (one coil)6.2 Ω
Sd81 in²
Xmax0.28″
Vd22.3 in³ calc.
Mms110 g calc.
BL16.8 T·m calc.
EBP65 — sealed or ported calc.
Sensitivity, 1 W / 1 m89.6 dB calc.

General

Size12″
Voice coilsdual 8 Ω
RMS power120 W

Mounting dimensions

Ø12 3/8″cutout Ø10 11/16″mounting depth 5 1/8″magnet Ø≈ 6 15/16″
Cutout diameter10 11/16″
Mounting depth5 1/8″
Overall diameter12 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 Dayton Audio 12″ models