The mk IV version of the Heritage line of Klipsch are not harsh. I own the Heresy IV and can listen to them all day long...
Another strength of the Heresy IV, anyway, is that it still sounds dynamic and expansive at even very low volumes.
I have used them with a Pioneer Elite avr (totl from about 2005), an Onkyo Integra receiver from 1986, and a Marantz Ruby amp. The Heresy IV sounds amazing with all of them, but the best pairing, not surprisingly, is the Marantz. The Elite though also works well, and the Integra is a workhouse and good too.