A few years ago I had the king of the hill MPS-1s, also worked with Lonnie over a period of 3 months, replacing the mono's, etc. The amp kept going into protect mode prematurely, far before the Denon 2805 (at the time) would even break a sweat. Can't comment on if they have resolved these issues, however, they said it was the fault of the m80's dropping to 1ohm, not.
I also have the MPS-1 driving M80's. I have not had the shut down issues that Randy did. I did have a buzz in one of my surround channels that Lonnie said was probably due to interference with a microwave tower - of which there is a large one within eyesight of my house. They gladly exchanged an amp module and I have been problem free since. Guess I'm one of the lucky ones.
Scott
