For a sedan, one sub, 275 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
29 Hz
Qts
0.42
Qes
0.44
Qms
7.59
Vas
1.16 ft³
Re
3.59 Ω
Sd
56.3 in²
Xmax
0.51″
Vd
28.8 in³ calc.
Mms
171 g calc.
BL
15.9 T·m calc.
EBP
66 — sealed or ported calc.
Sensitivity, 1 W / 1 m
84.6 dB calc.
General
Size
10″
Voice coils
4 Ω
RMS power
275 W
Mounting dimensions
Cutout diameter
9 3/16″
Mounting depth
5 7/8″
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.