For a sedan, one sub, 1,500 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
38.9 Hz
Qts
0.31
Qes
0.34
Qms
3.64
Vas
0.57 ft³
Re (one coil)
1.95 Ω
Sd
72.9 in²
Xmax
≈ 0.39″
Mms
323 g calc.
BL
21.3 T·m calc.
EBP
114 — suits ported calc.
Sensitivity, 1 W / 1 m
86.5 dB calc.
General
Size
12″
Voice coils
dual 2 Ω
RMS power
1,500 W
Mounting dimensions
Cutout diameter
≈ 11 1/8″
Mounting depth
≈ 5 7/8″
“≈” 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.