I liked his section on time alignment as well. Dr. Edgar's articles from his tratrix midrange mention putting the midrange in front of the highs similar to what Art mentions.

I took my horns out and set them about 8 inches behind the midrange the other day. Really messed things up. I've moved the midrange horn an inch or 2 in front of where the high frequencies come out and it seems to improve the sound (I'm running Waynes conical horn midrange).

I hope life is being kind to you these days.

Grant.