There are a lot of sub placement guides on the internet - search them up and try them out. For me it ended up being a compromise between best sound, free space and cable length.
I'm still haven't sorted out my 7.1. Bought speaker 6 & 7 about 6 months ago and they are still sitting in the box. Still need to invest in a 7.1 receiver but since 99% of the media I watch is still 5.1 or less (either MySkyHD or downloaded 720p 5.1 rips) I'm not in any hurry.
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