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There are a few things you can do to improve the performance of your surround speakers, and your entire home theater. Most surround receivers have a time delay function which allows you to delay the music signal to the rear speakers by a few milliseconds which gives the impression of a much larger listening room.
Experiment with different settings to see what sounds best in your homes. Speakers are acoustically tied to the room they play in. Thus, by treating the room you can improve the sound of your home theater. Try to get a balance of sound reflective surfaces like bare walls and hard wood floors and absorptive materials like rugs and drapes. A few well placed 'sound traps' will improve your system's performance.