For a sedan, one sub, 450 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
36.4 Hz
Qts
0.83
Qes
0.93
Qms
7.77
Vas
1.47 ft³
Re
3.7 Ω
Sd
82.3 in²
Xmax
0.51″
Vd
42.1 in³ calc.
Mms
184 g calc.
BL
12.9 T·m calc.
EBP
39 — suits sealed calc.
Sensitivity, 1 W / 1 m
85.3 dB calc.
General
Size
12″
Voice coils
4 Ω
RMS power
450 W
Mounting dimensions
Cutout diameter
11 1/16″
Mounting depth
4 3/8″
Overall diameter
12 1/2″
Magnet diameter
5 13/16″
“≈” 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.