Thank you for the response. I realize the Heresy speakers are more sensitive but higher volume isn't my goal. I want to divorce the bass driver from the high frequency signal path as much as possible. I ran my Infinity speakers with my McIntosh MC2002 for the better part of two decades, and also with my Carver TFM25 and both sounded great. But with my current set up the Emit-K tweeters really sing, so much more musical. Wish I had two of the Macs to try this with but it's just not possible at this time. I've been debating whether or not to try this same set up with two Carver TFM cb's as I do have these. But they're running my center channel and rears in my surround system along with the TFM25 running the mains.
I've searched crites site but to no avail on this query. My hope was someone here had tried this before and if they had any issues. I came to this site after reading a post here by Steve McCormack on passive bi amping in a google search. Not sure if Steve visits this site regularly but if he reads this maybe he will be able to give me the info I need.
Martin