For a sedan, one sub, 400 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
33.1 Hz
Qts
0.47
Qes
0.497
Qms
9.9
Vas
0.93 ft³
Re (one coil)
1.88 Ω
Sd
53.7 in²
Xmax
0.69″
Vd
37 in³ calc.
Mms
149 g calc.
BL
10.8 T·m calc.
EBP
67 — sealed or ported calc.
Sensitivity, 1 W / 1 m
84.8 dB calc.
General
Size
10″
Voice coils
dual 2 Ω
RMS power
400 W
Mounting dimensions
Cutout diameter
9 1/8″
Mounting depth
5 1/4″
Magnet diameter
5 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.