rucan65
You have a MF pre controlling a MF PA and the system sounds horrible. Hmmm....MF claims the M8s is the perfect match for the M8s-700 monoblocks. I find it difficult to believe why it would not be equally as good with the M8s500. This is odd. Perhaps there is some spec that dictates it is a better match for the M8s-700 than the M8s-500 but I do not know what that would be. Certainly not one that would make it so incomaptible as to sound horrible. I would contact MF or the seller.