As I've frequently pointed out, I think that the way to go is to simply put a bookshelf speaker vertically just above or just below the screen(e.g.the M2)and forget it. Again I don't know to what extent the TMMMT configuration changes the situation, but since the reference Tony makes to the SGHT tests on MTMs hasn't been illustrated, note my reply in
this thread on page 2 in which I linked to an SGHT review in which measurements at various frequencies and angles demonstrated a problem with the MTM there. Tom Norton also comments there on turning the thing vertically if it had been possible and the desireability of using their smaller speaker vertically instead.
