Low level buzzing coming from tweeters.


I now have a low level buzzing coming out of my tweeters even when i am in mute. It happens even with the amp on and preamp off never had this before.Any suggestions would be great.Thanks in advance.
ebm
Turn off amp. Disconnect the pre. Short the input to amp. Turn on amp. This is to see if it is coming from inside the amp or if it is being picked up from ourside the amp.

Wow! I’ve got the same problem. The mute does reduce the volume of the buzz. I did disconnect the preamp, but still a buzz. My monoblocks are each driving only the tweeters. Possibly both amps with the same issue, but this makes me think it might be an electrical problem? I tried unplugging every piece of gear and plugging the amps into different sockets . . . no luck. Any help would be greatly appreciated!
Any recent changes to cabling?  How about home electrical (e.g., new switches?) Could (unshielded?) speaker cable be picking up some airborne interference?