Plinius warm-up

I've read on these boards the issue that the Plinius 8200 needs plenty of warm up time to sound right. This has been my experience also. I was wondering if other people are hearing the same specific qualities that I am. When the amp is not warmed up, the mids and highs play back level is lower, the lack of frequency balance giving the amp a bland sound. But the bass seems to be just fine compared to a warmed up amp. Same for you?

Don