Dave. If I understand correctly you are listening to the surrounds/rears by themselves. Why?? You are supposed to listen to the music not the speakers or just one component of the music.

Also, if you find the bass thin, why do you continue to use the Audissey settings?

Listen to all the speakers with the surrounds/rears crossed much lower.

Last. The surrounds are there to add depth to music and give it an immersive sound, not to add meat/oompf/kick to your bass. If you have an issue with the bass, you should be taking issue with your mains.

Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!