For a sedan, one sub, 1,800 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
32.3 Hz
Qts
0.29
Qes
0.31
Qms
3.55
Vas
1.79 ft³
Re (one coil)
0.95 Ω
Sd
116.3 in²
Xmax
≈ 0.39″
Mms
381 g calc.
BL
15.4 T·m calc.
EBP
104 — suits ported calc.
Sensitivity, 1 W / 1 m
89.4 dB calc.
General
Size
15″
Voice coils
dual 1 Ω
RMS power
1,800 W
Mounting dimensions
Cutout diameter
≈ 14″
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.