Rockford Fosgate Power T1D215

15″ subwoofer · dual 2 Ω · 1,000 W RMS

Fs 26.3 HzQts 0.43Vas 3.60 ft³Xmax 0.65″

Recommended box

For a sedan, one sub, 1,000 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
Fc49 Hz
F3 (−3 dB, no cabin gain)47 Hz
Example box (outside)16 15/16″ × 16 15/16″ × 13 1/16″
Open sealed box in designer

Ported

Net volume4.77 ft³ (135 L)
Tuning (Fb)27 Hz
Portslot 3 1/8 × 16 5/16″, 33 9/16″ long
Port velocity at 1,000 W64 ft/s
F3 (−3 dB, no cabin gain)25 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

Fs26.3 Hz
Qts0.43
Qes0.46
Qms6.5
Vas3.60 ft³
Re (one coil)1.63 Ω
Sd131 in²
Xmax0.65″
Vd84.6 in³ calc.
Mms363 g calc.
BL14.6 T·m calc.
EBP57 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.1 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power1,000 W

Mounting dimensions

Ø≈ 15 1/8″cutout Ø13 15/16″mounting depth 8 3/8″magnet Ø≈ 9 1/16″
Cutout diameter13 15/16″
Mounting depth8 3/8″

“≈” 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 15″ models