For a sedan, one sub, 1,000 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
25.5 Hz
Qts
0.56
Qes
0.586
Qms
15.35
Vas
5.19 ft³
Re (one coil)
3.45 Ω
Sd
161.7 in²
Xmax
0.88″
Vd
142 in³ calc.
Mms
409 g calc.
BL
19.6 T·m calc.
EBP
43 — suits sealed calc.
Sensitivity, 1 W / 1 m
88.2 dB calc.
General
Size
15″
Voice coils
dual 4 Ω
RMS power
1,000 W
Mounting dimensions
Cutout (square, side)
13 3/4″
Mounting depth
8 11/16″
Magnet diameter
8 3/8″
“≈” 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.