I'm not up to speed on the newer avr's and the more modern two-channel preamps that have balanced connections as well as unbalanced. I can only assume that some of you have them and most of you do not.
For the last few years I've been implementing pro-amps into my systems with simple RCA to XLR cables....not properly converting the signal. I had read negative reviews on the ART Cleanbox units that convert unbalanced to balanced....many reviewers claiming that they added noise or some sort of hum to their systems. I was turned off by these claims so I never tried one.
Recently, I coughed up the measly $65.00 and decided to try one out. For $65.00 why didn't I try this five years ago? $65 bucks in this hobby is nothing. Well, I'm here to tell you that if you're running a pro-amp in your system without converting the signal properly you don't know what you're missing. The "ART Cleanbox Pro" straightened everything out.