Rockford Fosgate Power T0D412

12″ subwoofer · dual 4 Ω · 700 W RMS

26 HzFs, resonance
0.53Qts
1.95 ft³Vas
0.58″Xmax
700 WRMS

Recommended box

For a sedan, one sub, 700 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
1.52 ft³ (43 L)
Net volume
Qtc0.80
Fc39 Hz
F3 (−3 dB, no cabin gain)37 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 17 5/8″
Open sealed box in designer

Ported

deeper, louder
3.28 ft³ (93 L)
Net volume
Tuning (Fb)25 Hz
Portslot 2 3/8 × 14 5/16″, 39 1/4″ long
Port velocity at 700 W65 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 18 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26 Hz
Qts0.53
Qes0.58
Qms6
Vas1.95 ft³
Re (one coil)3.1 Ω
Sd84.9 in²
Xmax0.58″
Vd49.5 in³ calc.
Mms289 g calc.
BL15.9 T·m calc.
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m84.2 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power700 W

Mounting dimensions

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