so uh..... this thing is making a terrible sounding vibrating distortion. now i know that depending on how the boost is set with the master volume, it can create the overdrive channel, but my amp is making this terrible rattling noise even if the boost is at zero. last time this cab made this sound was when i first bought it (it was a voice coil out of alignments due to shipping) but now it is making the noise again, with neither the amp or the cab having been moved an inch. not only that, but it seems like the whole cab is making this noise, not just one speaker. any ideas? any way to isolate the source? i hate to call dave at avatar again and tell him something is up (even though he is the best customer service i have had ever had).