For a sedan, one sub, 3,500 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 Ported · SPL in dB at 1 W / 1 m, no cabin gain
Thiele/Small parameters
Fs
30.6 Hz
Qts
0.37
Qes
0.39
Qms
8.56
Vas
0.64 ft³
Re (one coil)
≈ 0.85 Ω
Sd
76.6 in²
Xmax
1.34″
Vd
102.5 in³ calc.
Mms
514 g calc.
BL
14.7 T·m calc.
EBP
78 — sealed or ported calc.
Sensitivity, 1 W / 1 m
83.3 dB calc.
General
Size
12″
Voice coils
dual 1 Ω
RMS power
3,500 W
Mounting dimensions
Cutout diameter
11 1/8″
Mounting depth
10 1/2″
Overall diameter
12 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.