Sorry if this is in the wring area or has been talked about before (I tried to use the search but got nothing on this topic)

I have owned the Epic 80 speakers for over a year and love them!! However, just this past month have been having problems with the center speaker. It crackles and buzzes very badly when in surround mode. I at first thought it may be my receiver (Sony ES series) and swapped it out for another one but got the same result. I also unscrewed one speaker and checked to make sure there was not any vibration with the face plate and the enclosure...all looked OK. I noticed the sound coming from all 5 speakers in the center unit but only at higher volumes. Could it be that I have blown the speaker...or could it be a crossover issue?

Any help and a possible fix would be appreciated!!

Thanks,

RPM