I set up my friends BP6's a few months ago. In his room that is 14 ft. wide and 18 feet deep, his speakers are about 16" from back wall, and about 4 feet from the side walls, putting about 5 to 6 feet between the towers themselves.

Just experiment and sooner or later you'll come across an area where your sound improves. Make sure they have the feet installed and tilted upwards atleast .5", A full Inch might be even better. Try toeing them in a bit but not too much.

Let your ears be the judge! Have fun

I wish I could help more. But trial and error is the best way to handle this situation.

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Play it LoUd!!