Rockford Fosgate Power T1D212

12″ subwoofer · dual 2 Ω · 800 W RMS

Fs 28 HzQts 0.52Vas 1.97 ft³Xmax 0.63″

Recommended box

For a sedan, one sub, 800 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 volume1.45 ft³ (41 L)
Qtc0.80
Fc43 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 16 15/16″
Open sealed box in designer

Ported

Net volume3.28 ft³ (93 L)
Tuning (Fb)27 Hz
Portslot 2 9/16 × 14 5/16″, 35 15/16″ long
Port velocity at 800 W65 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 18 3/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.52
Qes0.59
Qms4.5
Vas1.97 ft³
Re (one coil)1.63 Ω
Sd84.9 in²
Xmax0.63″
Vd53.5 in³ calc.
Mms246 g calc.
BL10.9 T·m calc.
EBP47 — suits sealed calc.
Sensitivity, 1 W / 1 m85.2 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power800 W

Mounting dimensions

Ø≈ 12 3/8″cutout Ø11 1/4″mounting depth 6 3/4″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth6 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