For a sedan, one sub, 300 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
35 Hz
Qts
0.63
Qes
0.76
Qms
3.82
Vas
0.89 ft³
Re
3.12 Ω
Sd
61.1 in²
Xmax
0.40″
Vd
24.5 in³ calc.
Mms
180 g calc.
BL
12.7 T·m calc.
EBP
46 — suits sealed calc.
Sensitivity, 1 W / 1 m
83.6 dB calc.
General
Size
10″
Voice coils
4 Ω
RMS power
300 W
Mounting dimensions
Cutout diameter
9 1/8″
Mounting depth
3 3/8″
Overall diameter
10 3/8″
“≈” 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.