Pass Labs 350.5 or 600.5 owners--breakin time.....

I had a 350 & now the 350.5. They both took 250 to 300 hours. The .5 was the shorter of the 2. In my experience they take you on a bit of a roller coaster ride, great one day, bad the next until the break in. But they will in time. Be patient.

I agree with HiFiguy, the relationship is a little rocky in the beginning, but after about 300 hrs they sing sweet like a bird. Well worth the wait.

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

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.

Thanks for all your responses! I'm just wondering what kind of time I'm looking at and the stages of change, which is fascinating. I'm looking forward to the final system sound though. Each monoblock is massive (21x19x11.5) and weighs 150 pounds. A friend was going to help me put them into the system, but I didn't want to wait. I put them on their amp stands myself. I'm glad I didn't blow out a disc in my back. Next time I'll wait for some help. The amps on their amp stands make my Egglestonworks Andra 2's look smaller than before... Pass Labs also rebuilt my X 0.2 preamp, which I bought used from a dealer about 8 months ago... new volume pot, new power supplies, plus alot more... no charge! Very nice people! Thnaks Pass Labs!!! I love hearing about the .5 amps. Very few actual reviews on the 600.5's... Thanks again guys!... Almost forgot--my wife likes the looks of the amps. She says "the blue lights look cool". So the WAF is good. A big plus.