I kinda have to agree that Klipsch speakers tend to be somewhat harsh. Some folks love that sound, but I've found it to be kinda fatiguing. I've never owned them myself, but had a good friend who owned the refrence series with the anodized looking drivers from a few years back. They were just hard to listen too. Maybe pairing that up with the Adcom, which I also think is a bit on the "in your face" side could be a bit much. I still have my Adcom amps and love them, but they do have a very clinical straightforward sound I think.
It is preference, but I'm not sure how you go about changing the characteristic sound of a speaker like Klipsch.