i found the same. it took abour 300 hrs. for my 600.5's to really break in. its tough but be patient, it is well worth the wait.
klzdo
klzdo
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