For a sedan, one sub, 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
40 Hz
Qts
0.51
Qes
0.62
Qms
3
Vas
0.72 ft³
Re (one coil)
2.1 Ω
Sd
58.4 in²
Xmax
0.31″
Vd
18.4 in³ calc.
Mms
155 g calc.
BL
11.5 T·m calc.
EBP
65 — sealed or ported calc.
Sensitivity, 1 W / 1 m
85.3 dB calc.
General
Size
10″
Voice coils
dual 2 Ω
RMS power
200 W
Mounting dimensions
Cutout diameter
9 1/16″
Mounting depth
2 15/16″
Overall diameter
10 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.