My M80's are sounding better all the time. I was leaning toward returning them. But I am having second thoughts. The M80's have better midrange definition. Drums sound more like drums. You can the tone of the drum instead of some thuds. The BA's have the extended high end. They sound very good together. I would like to take out one of the tweeters on he M80 and put the boston tweeter in it's place. Might be the perfect speaker then.