Originally Posted by tonygeno
If you have a balanced source, that is correct. The issue is that when using XLR pro amps with a consumer source (RCAs) you need an adapter that essentially unbalances the signal, increasing the likelihood of hum.
OK suppose the prepro has balanced outs, running to the pro amps. Do the DVD player, CD player, etc. also need to have balanced outs to the prepro, in order to decrease the chance of hum?