Bobby, that rising frequency response isn't typical of the regular Audyssey correction. Are you sure that you didn't set the correction parameter to "flat"(which emphasizes the high frequencies more)rather than the normal "Audyssey" curve? A remote possibility would be a defective microphone reading the high frequencies too low and causing them to be boosted unnecessarily.
Also, as Ken suggested, don't use 5-channel stereo for normal music listening. The way to put the surrounds into action with 2-channel music material is to apply DPLII or similar ambience extraction processing.
