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It's the goal of the receiver to get -0 dB to be "reference", so it just may be that the M80s are that efficient.

The number on the display doesn't really mean all that much, and really can't be directly compared between receivers, and that goes doubly so for different brands.

Don't worry what the number reads, just set the volume to a comfortable listening level for you. As long as it isn't in the + range, you'll be fine (the noise floor rises quickly when you get above 0).