For a sedan, one sub, 4,500 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
28.8 Hz
Qts
0.33
Qes
0.35
Qms
7.45
Vas
1.33 ft³
Re (one coil)
≈ 0.85 Ω
Sd
122.6 in²
Xmax
1.34″
Vd
164.1 in³ calc.
Mms
721 g calc.
BL
17.8 T·m calc.
EBP
82 — sealed or ported calc.
Sensitivity, 1 W / 1 m
86.1 dB calc.
General
Size
15″
Voice coils
dual 1 Ω
RMS power
4,500 W
Mounting dimensions
Cutout diameter
14 1/4″
Mounting depth
12″
Overall diameter
15 11/16″
“≈” 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.