For a sedan, one sub, 500 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
30.4 Hz
Qts
0.56
Qes
0.64
Qms
4.76
Vas
3.16 ft³
Re
3.2 Ω
Sd
124.6 in²
Xmax
0.49″
Vd
61.3 in³ calc.
Mms
280 g calc.
BL
16.4 T·m calc.
EBP
48 — suits sealed calc.
Sensitivity, 1 W / 1 m
88 dB calc.
General
Size
15″
Voice coils
4 Ω
RMS power
500 W
Mounting dimensions
Cutout diameter
13 7/8″
Mounting depth
7 1/16″
“≈” 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.