For a sedan, one sub, 125 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
0.62
Qes
0.66
Qms
10.06
Vas
1.19 ft³
Re
3.9 Ω
Sd
51.2 in²
Xmax
0.50″
Vd
25.8 in³ calc.
Mms
94 g calc.
BL
11.1 T·m calc.
EBP
53 — sealed or ported calc.
Sensitivity, 1 W / 1 m
85.4 dB calc.
General
Size
10″
Voice coils
4 Ω
RMS power
125 W
Mounting dimensions
Cutout diameter
9 3/8″
Mounting depth
4 3/4″
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.