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
48 Hz
Qts
1.02
Qes
1.2
Qms
6.8
Vas
0.59 ft³
Re
3.52 Ω
Sd
56.7 in²
Xmax
0.21″
Vd
12.1 in³ calc.
Mms
126 g calc.
BL
10.6 T·m calc.
EBP
40 — suits sealed calc.
Sensitivity, 1 W / 1 m
83.8 dB calc.
General
Size
10″
Voice coils
4 Ω
RMS power
200 W
Mounting dimensions
Cutout diameter
≈ 9 1/8″
Mounting depth
3 1/16″
Overall diameter
10 1/8″
Magnet diameter
5 1/4″
“≈” 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.