There's another thread in the receiver/separates section, but it ended up to be more about wiring 2 speakers in series or parallel for 7.1 with 6.1 channels of amplification. Anyway... I have direct radiators for the front 3, bipolars for the surrounds. What should I do for the rears? Dipoles? Or direct radiators? For a THX Ultra2 or Logic 7 type setup (non-mono rears). I'm kind of limited in that the speakers will sit on a sort of shelf thing that's on top of my desk back there. So there won't be much space between them and the back of the shelf. The front L + R and the surround L + R are (more or less) full range towers, but I cross them over anyway. The rears will have to be bookshelf size. Thanks!