How do you get balanced sound on a surround sound system?

Ususally every receiver comes with a mic that you hook up to the receiver right after you hook up all the speakers and the sub. If your receiver doesnt already sense that the jack is in you may have to go to the menu manually. put the mic where you will usually be sitting the the area and at about head height. now your speakers and sub will make different sounds, the receiver calculates these sounds and even measures your room by sound. now your surround system is set to go. remember you can always manually tweak you sound. hope this helps