Like i said, I will check all the wireing, pull it all apart and redo it. Then i will test with the Advents. I'm rather hesitant, to test anymore with the Onkyo, for fear of doing damage.

If the M80's both work at a lower volume...say about 50 watts or less(acording to the meters) I'm not sure, what good it would do to test 1 speakers at a time, plus probably do the amp no good.