PRO1343 HEADPHONE AMPLIFIER STEREO 3.5MM & RCA INPUTS PRO2 A-1343PRO1343 PRO2 HEADPHONE AMPLIFIER WITH STEREO 3. 5MM AND RCA INPUTS If your headphones are always a lot quieter than you'd prefer, and cranking the volume is not an option, then perhaps the PRO1343 is perfect for you. The compact size and multiple input and output types means you can hook it up to your AV Receiver's pre out or your PC's headphone socket. Many headphone outputs are simply not designed to power higher impedance, large driver headphones;