Rockford Fosgate Power HX2 RFR3112

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

Fs 26 HzQts 0.35Vas 1.15 ft³Xmax 0.75″
The published specs don’t add up:

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 volume0.78 ft³ (22 L)
Qtc0.55
Fc41 Hz
F3 (−3 dB, no cabin gain)58 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume1.62 ft³ (46 L)
Tuning (Fb)25 Hz
Port2 round ports Ø2 1/2″, 24 7/16″ long
Port velocity at 1,000 W197 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)30 3/16″ × 15 3/4″ × 9 7/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26 Hz
Qts0.35
Qes0.37
Qms5.64
Vas1.15 ft³
Re (one coil)2.12 Ω
Sd84 in²
Xmax0.75″
Vd62.8 in³ calc.
Mms477 g calc.
BL21.1 T·m calc.
EBP70 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.9 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,000 W

Mounting dimensions

Ø12 1/2″cutout Ø10 13/16″mounting depth 7 1/16″magnet Ø≈ 7 1/16″
Cutout diameter10 13/16″
Mounting depth7 1/16″
Overall diameter12 1/2″

“≈” 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