So I think it can handle them, just not sure if it would have issues or not. I am not even sure what setting I would use since I would have speakers of each (4ohm,6ohm,8ohm)
Leave it set at 6ohm or off if possible, that switch is not needed for reasons that someone else can probably explain better than I.
Could I have an amp run fronts and centers maybe and let the Onkyo handler the rest. Would this get me away from the issue with the Onkyo, if I do have one. Is this even possible or something people do?
Yes, if you are worried about the Onkyo or it does't perform how you like, you can have a 2 channel amp run the M80's and the receiver run the rest.
