I know this is an old thread but it seems like it was made for my questions. I use a Rotel rb991 and an older pioneer elite vsx45tx as my pre on a two channel setup.
When I use rca connections I get substantial hum, my avr does not have balanced outs so to get rid of all the noise from the RCA’s I purchased an rca to xlr adapters and that took care of the hum but my volume decreased by half.
I do however have a stronger and tighter bass, actually the whole sound is now very uncolored, I have been told if I go to a pre that has balanced out to the amps balanced I will get some of my volume back because the adapters mute the signal in some way? Where I was listening at a pretty loud -30db is now at reference to come close to the old unbalanced connection.
Im a musician and I compare the difference in sound from unbalanced to balanced like playing my guitar through a high gain amp head without any processor, it’s dry and precise, the unbalanced sounds louder but like I added some delay and reverb, a very manufactured sound.
You guys seem very educated in all this and I’ve enjoyed reading what has been discussed so far,just trying to further my understanding by picking your brains.