For a sedan, one sub, 1,200 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
32.7 Hz
Qts
0.42
Qes
0.45
Qms
7.08
Vas
0.67 ft³
Re (one coil)
1.6 Ω
Sd
79.1 in²
Xmax
1.18″
Vd
93.4 in³ calc.
Mms
462 g calc.
BL
18.4 T·m calc.
EBP
73 — sealed or ported calc.
Sensitivity, 1 W / 1 m
83.7 dB calc.
General
Size
12″
Voice coils
dual 2 Ω
RMS power
1,200 W
Mounting dimensions
Cutout diameter
10 7/8″
Mounting depth
7 1/2″
Overall diameter
12 5/8″
“≈” 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.