Thanks for the nice comments clarky. Sorry if I sound like your Dad, I do sort of treat you that way because, well, I'm definitely old enough to be.
Anyway, one of the high points with N-cores is that they didn't seem to need long break-in or warm-up periods. I left them on playing music for overnight and although there was a very slight improvement, I wouldn't swear I could hear it in DBT. They were pretty darn good right out of the box.