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
25.2 Hz
Qts
0.44
Qes
0.463
Qms
7.25
Vas
1.56 ft³
Re
2.23 Ω
Sd
53.6 in²
Xmax
0.45″
Vd
24.1 in³ calc.
Mms
153 g calc.
BL
10.8 T·m calc.
EBP
54 — sealed or ported calc.
Sensitivity, 1 W / 1 m
83.9 dB calc.
General
Size
10″
Voice coils
2 Ω
RMS power
300 W
Mounting dimensions
Cutout diameter
9 1/16″
Mounting depth
4 5/8″
Overall diameter
10 1/2″
Magnet diameter
4 15/16″
“≈” 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.