FWIW, my local and longtime Maggie dealer, when I asked him this very same question on my last visit, indicated that he did think the 3.7 competed with the 20.1 in certain ways (and was a worthwhile improvement from the 3.6, a speaker I greatly admired). But whatever he may have specifically elaborated I can't recall exactly anymore (though I seem to think it had something to do with the midrange), and I haven't auditioned them yet (he offered but I didn't have the time then). Sorry, great help, I know! (Thanks to Gmorris for pointing out the lack of biampability, I hadn't realized this.)
