Just what I was going to ask, Steve. Amongst Eminent Technology LFT-8 owners, there is a set-up called "stacking" two pair of the speakers. It's not literal stacking, it's placing two of the speakers (which are mirror-imaged, tweeters on opposite sides of the left and right speakers) side-by-side, with the edges that the quasi-ribbon tweeters are mounted right up against placed together. This creates a sort of large co-ax driver, with the two quasi-ribbons surrounded by magnetic planar mid/woofers. The problem I saw with the arrangement is that, though the ribbons are next to each other, there is still a couple of inches separating them. Comb-filtering?