I'm not sure how the discussion might range since Russel's version has a very specific and proprietary equalization. I'm not sure that any DIY could match the equalization that he has on his system.That said, I have three separate amps amplifying three separate arrays in my Calipso's. When I put them together, the first one completed was the midrange. So for awhile I listend to just the midrange operated as a full range(the SAMMI's are full range speakers). I was astounded by the quality and didn't really notice any comb filtering since when I listen I SIT STILL. The bass was great the high's were smooth.
Then I added the tweeters and discovered what I was missing in the high's. But it all still sounded great. and then I added the woofers and discovered the real missing bass.
I have a nice constant Q equalizer which I've never needed nor used. I've not heard Russell's speaker system.
Marlboro