Rockford Fosgate Power T2D212

12″ subwoofer · dual 2 Ω · 1,200 W RMS

38.7 HzFs, resonance
0.49Qts
0.48 ft³Vas
0.88″Xmax
1,200 WRMS

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

smaller, tighter
0.78 ft³ (22 L)
Net volume
Qtc0.62
Fc49 Hz
F3 (−3 dB, no cabin gain)59 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 11 3/8″
Open sealed box in designer

Ported

deeper, louder
1.27 ft³ (36 L)
Net volume
Tuning (Fb)30 Hz
Port2 round ports Ø2 1/2″, 21 7/16″ long
Port velocity at 1,200 W213 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)20 1/4″ × 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

Fs38.7 Hz
Qts0.49
Qes0.54
Qms5.15
Vas0.48 ft³
Re (one coil)1.7 Ω
Sd66.7 in²
Xmax0.88″
Vd58.5 in³ calc.
Mms326 g calc.
BL15.8 T·m calc.
EBP72 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.6 dB calc.

General

Size12″
Voice coilsdual 2 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