Its coming from the bass driver section. It doesn't happen when they've been off for a while but it does happen just after I shut them off.
I think its scared of me since I posted on here. Because it hasn't made a peep since! :think:
I have a pair of Martin Logan Summits. My left channel will just start vibrating sometimes. Not real loud but definitely audible. It kinda sounds like forgive me for trying to reproduce this in typespeak. (mmmhhhhhnnng.......) It will happen even when my amp is not on. (It is still technically...