For a sedan, one sub, 3,500 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
27.6 Hz
Qts
0.48
Qes
0.52
Qms
6.56
Vas
2.49 ft³
Re (one coil)
0.65 Ω
Sd
125.6 in²
Xmax
1.30″
Vd
163.1 in³ calc.
Mms
439 g calc.
BL
9.8 T·m calc.
EBP
53 — sealed or ported calc.
Sensitivity, 1 W / 1 m
86.5 dB calc.
General
Size
15″
Voice coils
dual 1 Ω
RMS power
3,500 W
Mounting dimensions
Cutout diameter
14 1/8″
Mounting depth
11″
Overall diameter
15 5/8″
“≈” 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.