For a sedan, one sub, 300 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
29.7 Hz
Qts
0.59
Qes
0.625
Qms
11.41
Vas
2.69 ft³
Re (one coil)
1.85 Ω
Sd
100 in²
Xmax
0.49″
Vd
49.2 in³ calc.
Mms
222 g calc.
BL
11.1 T·m calc.
EBP
48 — suits sealed calc.
Sensitivity, 1 W / 1 m
87 dB calc.
General
Size
12″
Voice coils
dual 2 Ω
RMS power
—
Mounting dimensions
Cutout (square, side)
11″
Mounting depth
6 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.