Rockford Fosgate Power T2D412

12″ subwoofer · dual 4 Ω · 1,200 W RMS

Fs 39.9 HzQts 0.59Vas 0.48 ft³Xmax 0.87″

Recommended box

For a sedan, one sub, 1,200 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 volume0.78 ft³ (22 L)
Qtc0.76
Fc51 Hz
F3 (−3 dB, no cabin gain)49 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 11 3/8″
Open sealed box in designer

Ported

Net volume1.62 ft³ (46 L)
Tuning (Fb)30 Hz
Portround port Ø2 1/2″, 7 1/4″ long
Port velocity at 1,200 W483 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)22 9/16″ × 15 3/4″ × 11 7/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.9 Hz
Qts0.59
Qes0.67
Qms5.31
Vas0.48 ft³
Re (one coil)3.4 Ω
Sd66.7 in²
Xmax0.87″
Vd58 in³ calc.
Mms306 g calc.
BL19.7 T·m calc.
EBP60 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.1 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,200 W

Mounting dimensions

Ø≈ 11 15/16″cutout Ø10 13/16″mounting depth 8 7/8″magnet Ø≈ 7″
Cutout diameter10 13/16″
Mounting depth8 7/8″

“≈” 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.

Data sources

Other Rockford Fosgate 12″ models