Gene

Why 7? We've got the original 5, of course. But for the 6th channel (the "center surround" as I think it was sometimes called on the 1050), we split it out to two speakers and get 7. The "official" 7-channel systems (Dolby Digital EX/THX EX and DTS ES) all send the same signal to both teh 6th and 7th speakers, so the 7 sort of sneaks in.

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Gonk