Mike and Eric:
Thank you both for your thoughts.
Mike, I looked at your measurements.
Observations:
I have to agree, I hear comb filtering which is probably the worst aspect of the Heresys, or any speakers, for me.
My K-77M tweeters are much hotter than yours.
Eric, I will look at your bandpass design, which would seem to solve some of the issues.
If you'd suggest a particular thread with your most recent work, I'd appreciate it.
In the mid term I hope to get Soundeasy software, which will help me design networks and increase my measurement capabilities.
What to do right now? Well I'm learning....