I'm assuming you're talking about the back surrounds in a 7.1 setup. While the QS8s will certainly work wonderfully, 12 ft is a pretty big distance and direct firing like the M2s should work very well as well and be a more cost effective if that's of any concern. What are your other speakers?

Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."