I have the 875 with the M80's and am happy with it. Initially it would cut out at high volumes around 105db as I did have it in a confined space. Since then I have taken the receiver out of the cabinet to let it breath and it is much improved. I can now reach levels of 110db on music and it will not cut out. When I play Kung Fu Panda on blu-ray it still does cut out at reasonably high levels. I should note that I am not currently using a subwoofer which must be putting more strain on the 875 as the M80's 4 ohm load is used for the power hungry low frequencies as well.
