Kevin,
Quote:
Somehow I get the feeling, that ancient man, never confused the growl of a saber tooth tiger from *behind* him to *in front of* him.
Hey, I don't know where in our evolutionary biology this phenomenon comes from but it's there, repeatable and demonstrable. Companies like Lexicon, Meridian, DTS, THX, etc, all discourage the use of a single back speaker.

If someone absolutely wants to go with a 6.1 set-up, I'd recommend they do what Gonk has done: use a dipole behind the listening position. This way, there is an acoustic null pointing at the listener's head, as opposed to direct sound along the centre line coming from right behind.

Best,
Sanjay
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Sanjay