Rockford Fosgate Power T112D2 (2004)

12″ subwoofer · dual 2 Ω · 600 W RMS

Fs 31 HzQts 0.47Vas 1.23 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 600 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

Net volume0.67 ft³ (19 L)
Qtc0.80
Fc52 Hz
F3 (−3 dB, no cabin gain)50 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume2.15 ft³ (61 L)
Tuning (Fb)29 Hz
Portslot 1 15/16 × 14 5/16″, 37 1/4″ long
Port velocity at 600 W65 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 11/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31 Hz
Qts0.47
Qes0.53
Qms4.46
Vas1.23 ft³
Re (one coil)1.55 Ω
Sd71 in²
Xmax0.55″
Vd39.1 in³ calc.
Mms225 g calc.
BL11.3 T·m calc.
EBP58 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.9 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power600 W

Mounting dimensions

Ø12 3/4″cutout Ø10 13/16″mounting depth 6 3/4″magnet Ø≈ 7 1/16″
Cutout diameter10 13/16″
Mounting depth6 3/4″
Overall diameter12 3/4″

“≈” 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.

Data sources

Other Rockford Fosgate 12″ models