The M80s should not have those characteristics. Have you checked to be absolutely sure that the M80s are wired both in phase (positive from amp to positive on the M80s). A harsh top end and weak bass will be the result if one of the speakers is wired out of phase. If everything is wired properly I would suggest getting a hold of Joe Vassallo at joe@axiomaudio.com or at our toll free number 866-294-6688. I will let him know about what you are finding and we can replace your M80s for you and investigate yours at our lab.
