For a sedan, one sub, 700 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
41.5 Hz
Qts
0.60
Qes
0.697
Qms
4.22
Vas
0.60 ft³
Re (one coil)
3.8 Ω
Sd
51.9 in²
Xmax
0.41″
Vd
21.4 in³ calc.
Mms
138 g calc.
BL
14 T·m calc.
EBP
60 — sealed or ported calc.
Sensitivity, 1 W / 1 m
84.4 dB calc.
General
Size
10″
Voice coils
dual 4 Ω
RMS power
700 W
Mounting dimensions
Cutout diameter
9 7/16″
Mounting depth
3 1/8″
Overall diameter
10 3/16″
“≈” 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.