Rockford Fosgate Power T2D415

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

Fs 31 HzQts 0.61Vas 1.82 ft³Xmax 0.88″

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 volume2.58 ft³ (73 L)
Qtc0.80
Fc41 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)16 15/16″ × 16 15/16″ × 21 3/16″
Open sealed box in designer

Ported

Net volume4.52 ft³ (128 L)
Tuning (Fb)27 Hz
Portslot 3 3/8 × 16 5/16″, 38 1/8″ long
Port velocity at 1,200 W66 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 22 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31 Hz
Qts0.61
Qes0.69
Qms5.49
Vas1.82 ft³
Re (one coil)3.4 Ω
Sd116.3 in²
Xmax0.88″
Vd102.5 in³ calc.
Mms407 g calc.
BL19.8 T·m calc.
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m85.5 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power1,200 W

Mounting dimensions

Ø≈ 14 15/16″cutout Ø13 3/4″mounting depth 9 13/16″magnet Ø≈ 8 15/16″
Cutout diameter13 3/4″
Mounting depth9 13/16″

“≈” 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 15″ models