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
28 Hz
Qts
0.28
Qes
0.32
Qms
2.38
Vas
2.08 ft³
Re
3.7 Ω
Sd
54.3 in²
Xmax
0.30″
Vd
16.4 in³ calc.
Mms
95 g calc.
BL
13.9 T·m calc.
EBP
88 — sealed or ported calc.
Sensitivity, 1 W / 1 m
88.1 dB calc.
General
Size
10″
Voice coils
4 Ω
RMS power
300 W
Mounting dimensions
Cutout diameter
9 1/4″
Mounting depth
4 7/8″
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.