They sound great with the HK X30 series receivers.
I had a pair of Heresy's that I paired with a restored Marantz 2250 receiver. It was a pretty good combination overall. I would recommend modest power with a warmer sound. The top end and upper mid-range can get pretty hot with SS gear that is on the bright side. The lower power Marantz receivers, like a 2230 when properly restored, seem to work very well with smaller efficient speakers.
I use a Pioneer SX-780. I have also used a Pioneer Elite VSX-D709 and might try my Marantz Sixteen.
Well, I made good on my threat today. Now I gotta find out what to do with a Pioneer SX-780 on which the channels cut out. What is the best and most ethical way to get rid of it?
PIONEER sx-880. Never gone to noon on the dial and it's crystal clear!