I was watching Saving Private Ryan on DVD (DTS version). I had it loud, -5 db. During the opening battle scene when Tom Hanks gets "stunned" and everything sounds muffled, I can hear a buzzing sound coming from my right RC-7 woofer. If I lower the volume, the tone changes, and if I continue to lower the volume, it goes away. I can only hear the buzzing during this part of the movie. However, it may be because the rest of the movie has loud clear sounds. I watched this part on my Sony HTIB and could not hear the same sound during the same part of the movie.
I also ran the AVIA bass-management test on the center channel and could hear the same buzzing from the same woofer. It is not a loud buzzing but can be heard at the listening position when the volume is loud.
Note that when watching a movie, you cannot hear the buzzing throughout the movie, only at certain parts. Does this mean the RC-7 is having some problem with only certain frequencies? Is it blown?