They are super sensitive. I had this problem with the original CA 200 and it was an MIT speaker cable. I sent it back twice to MIT and they could not find anything wrong with it. They tried to put in a zobel and it still did it. Always occurred several minutes into playback. Had to ditch the SC.
This amp also does not like one of my tube preamps. I still have the amp and I love the midrange bloom.
This amp also does not like one of my tube preamps. I still have the amp and I love the midrange bloom.