For a sedan, one sub, 800 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 Hz
Qts
0.52
Qes
0.56
Qms
7.05
Vas
1.03 ft³
Re (one coil)
≈ 1.7 Ω
Sd
82.3 in²
Xmax
0.59″
Vd
48.6 in³ calc.
Mms
267 g calc.
BL
13.5 T·m calc.
EBP
64 — sealed or ported calc.
Sensitivity, 1 W / 1 m
85.9 dB calc.
General
Size
12″
Voice coils
dual 2 Ω
RMS power
800 W
Mounting dimensions
Cutout diameter
11 3/16″
Mounting depth
6 11/16″
Overall diameter
12 11/16″
Magnet diameter
6 11/16″
“≈” 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.