I am considering segregated 5.1 and stereo systems in the same room. The smaller, stand-mounted 5.1 front main speakers and the larger (but still on a stand or pedestal) stereo speakers will be flanking an RPTV. A subwoofer will be used only with the 5.1 HT system. Are there any specific recommendations, caveats, precautions, or no-nos regarding this setup and placement of these different speakers? Should the stereo pair lie outside the HT pair, or vice-versa? Should one pair be closer to the listening position than the other? Any concerns with diffraction or other sound alteration, etc.? Thanks for your help.