For a sedan, one sub, 1,750 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
36.6 Hz
Qts
0.32
Qes
0.33
Qms
7.46
Vas
0.95 ft³
Re (one coil)
0.7 Ω
Sd
74.4 in²
Xmax
0.94″
Vd
70.3 in³ calc.
Mms
229 g calc.
BL
10.6 T·m calc.
EBP
111 — suits ported calc.
Sensitivity, 1 W / 1 m
88 dB calc.
General
Size
12″
Voice coils
dual 1 Ω
RMS power
1,750 W
Mounting dimensions
Cutout diameter
11 1/8″
Mounting depth
6 3/4″
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.