For a sedan, one sub, 600 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
0.92
Qes
1.116
Qms
5.18
Vas
0.77 ft³
Re
≈ 3.4 Ω
Sd
≈ 52.7 in²
Xmax
0.20″
EBP
43 — suits sealed calc.
Sensitivity, 1 W / 1 m
85.4 dB calc.
General
Size
10″
Voice coils
4 Ω
RMS power
600 W
Mounting dimensions
Cutout diameter
9 1/8″
Mounting depth
3 3/8″
Overall diameter
11″
“≈” 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.