For a sedan, one sub, 4,000 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
35 Hz
Qts
0.40
Qes
0.43
Qms
5.25
Vas
2.26 ft³
Re (one coil)
2 Ω
Sd
130.8 in²
Xmax
0.69″
Vd
90.1 in³ calc.
Mms
326 g calc.
BL
18.3 T·m calc.
EBP
81 — sealed or ported calc.
Sensitivity, 1 W / 1 m
90.1 dB calc.
General
Size
15″
Voice coils
dual 2 Ω
RMS power
4,000 W
Mounting dimensions
Cutout diameter
14 1/8″
Mounting depth
10 1/4″
Overall diameter
15 9/16″
“≈” 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.