I had the Luxman L-505u for less than a year and I used the Nordost Red Dawn's XLR with my cd player and the Bis Audio Cuivre-S RCA from my phono preamp to the amp. Appart from the gain which is higher with the XLR, I found no advantage with the XLR. Both of these cables are neutral and similar.
For the speakers, it was Van den Hul CS122 with great results combine with a pair of Harbeth SHL5.
Sebastien
For the speakers, it was Van den Hul CS122 with great results combine with a pair of Harbeth SHL5.
Sebastien