Most "rear channel" speakers I have found have both a Dipole and Bipole mode. Which one suits you best will have to do with your room acoustics, and the relationship between you and speaker placement (i.e. behind you, directly to the side etc.) In my experience, these type speakers have a great advantage over a "direct radiating" type for surround applications. Set up correctly, they will vanish and all you will hear are the effects. I have Martin Logan mains, but kept my Polk f/x 1000 rears. They sound better than anything else I have heard so far. And unless you are a real movie freak, why pay more for something you will hear maybe 20% of the time? Although I would not go too small or cheap in case you might want to hear music 5.1 formats or have all speakers on at once. Hope that helps-good luck, Michael
