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
38.4 Hz
Qts
0.47
Qes
0.511
Qms
5.67
Vas
0.83 ft³
Re
3.4 Ω
Sd
53.6 in²
Xmax
0.35″
Vd
19 in³ calc.
Mms
124 g calc.
BL
14.1 T·m calc.
EBP
75 — sealed or ported calc.
Sensitivity, 1 W / 1 m
86.1 dB calc.
General
Size
10″
Voice coils
4 Ω
RMS power
300 W
Mounting dimensions
Cutout diameter
9 1/16″
Mounting depth
3 5/8″
Overall diameter
10 5/16″
“≈” 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.