For a sedan, one sub, 550 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
31 Hz
Qts
0.54
Qes
0.6
Qms
5.5
Vas
0.60 ft³
Re (one coil)
3.1 Ω
Sd
49.6 in²
Xmax
0.58″
Vd
28.9 in³ calc.
Mms
225 g calc.
BL
15 T·m calc.
EBP
52 — sealed or ported calc.
Sensitivity, 1 W / 1 m
81.3 dB calc.
General
Size
10″
Voice coils
dual 4 Ω
RMS power
550 W
Mounting dimensions
Cutout diameter
9 1/8″
Mounting depth
6 1/2″
“≈” 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.