Rockford Fosgate Power T1D412

12″ subwoofer · dual 4 Ω · 800 W RMS

Fs 29.2 HzQts 0.61Vas 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 volume1.94 ft³ (55 L)
Qtc0.87
Fc41 Hz
F3 (−3 dB, no cabin gain)37 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 5/8″
Open sealed box in designer

Ported

Net volume3.28 ft³ (93 L)
Tuning (Fb)29 Hz
Portslot 2 3/4 × 14 5/16″, 33 1/16″ long
Port velocity at 800 W61 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 18 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.2 Hz
Qts0.61
Qes0.71
Qms4.5
Vas1.97 ft³
Re (one coil)3.25 Ω
Sd84.9 in²
Xmax0.63″
Vd53.5 in³ calc.
Mms226 g calc.
BL13.8 T·m calc.
EBP41 — suits sealed calc.
Sensitivity, 1 W / 1 m84.9 dB calc.

General

Size12″
Voice coilsdual 4 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