What should I hear as my amp breaks in?

Ok my Bryston 14b3 just came I today. Immediately I noticed the music came out of a darker background and the music was sweeter and vocals clearer. Now this is replacing an 18 year old 14bsst that was bought used. I had bought a new 4bsst in 02 and can vaguely remember some changes. I don't get to change amps like some get to change cars every year. So from every ones memeory, what can I expect to hear from now? Its been running for 8 hours and im keeping it runninh 24/7. I'm recovering from surgery and have time to listen. Well it was tricky getting that 89lb beast out of the box with a broke foot. But I used a lot of finesse and I was going to get it running today. I know my Bryston and Tandberg gear liked to be juiced up all the time. So let me hear from members here. Thanks. Mike