For a sedan, one sub, 280 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
30 Hz
Qts
0.80
Qes
0.95
Qms
5
Vas
0.88 ft³
Re
3.2 Ω
Sd
53.6 in²
Xmax
0.43″
Vd
23.2 in³ calc.
Mms
191 g calc.
BL
11 T·m calc.
EBP
32 — suits sealed calc.
Sensitivity, 1 W / 1 m
80.5 dB calc.
General
Size
10″
Voice coils
4 Ω
RMS power
280 W
Mounting dimensions
Cutout diameter
9 3/16″
Mounting depth
3 7/16″
Overall diameter
10 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.