Rt800i Midrange Vibration

[STUFFMD]

Hey Guys, Almost since I purchased my 800's I have had a vibration, which seems to come from the mids, especially in what I am using as the right speaker. I does not seem to happen in soundtracks, and in certain DVD's at only moderate levels(12 to 1 o'clock on my reciever) after they warm up. Is there possibly somthing wrong with the drivers??? or maybe the Mids are just loose. Am I voiding any warrenties on my units if I open them up to check for tightness.
Any advise would be appreciated.
Thanks, Stuff

[RuSsMaN]

First, 12 -1 on the dial is TOO high. Get a more powerful rec/amp, you risk clipping.

Second, if it happens after it warms up, the voicecoil could be near to overheating, expanding, and seizing (due to clipping).

Could be a bum driver also, need to swap it with the other speaker to rule out a xover issue.

Cheers,
Russ