Talon4, I have had the 350.5 and now run my system with XA-100's, both took about 200 to 250 hours to reach burn-in, after that there is a slow process of change towards their final performance signature. I would love to hear your final opinion regarding your 600.5's, I believe that Nelson Pass and his crew really "nailed it" with the .5 and XA series amps.
Pass Labs 350.5 or 600.5 owners--breakin time.....
I just bought a pair of Pass Labs 600.5 monoblocks which now have about 25 hours playing time on them. They are starting to finally open up in the upper registers and in detail. Still kind of veiled though... They sound better after 4+ hours of play. Could anyone comment on the total breakin time and what they may sound like after say 100 hours? Thanks! Stan