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
45.4 Hz
Qts
0.36
Qes
0.37
Qms
18.96
Vas
1.78 ft³
Re
2.8 Ω
Sd
130.7 in²
Xmax
0.28″
Vd
36 in³ calc.
Mms
245 g calc.
BL
23 T·m calc.
EBP
123 — suits ported calc.
Sensitivity, 1 W / 1 m
93.1 dB calc.
General
Size
15″
Voice coils
4 Ω
RMS power
1,800 W
Mounting dimensions
Cutout diameter
≈ 14″
Mounting depth
≈ 7 1/16″
Magnet diameter
8 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.