i have the Pass XA25 too and use the balanced out connections from my Cary SLP 05 preamp. I used to have a balanced amp and wanted to re use the excellent van den hul XLR cables. At the amp I use a neutrik female XLR to male RCA cable adapter. it may be the Cary preamp circuitry but the sound is much better using the balanced outs vs RCA outs.