I auditioned the M50s up against a pair of M22s. At first, I thought they sounded even. After a week or so, the booksheves surpassed the towers, so I had no choice but to return the M50s. While the 50s had a very pleasant bass presence, I found that they were weaker in the mids so in my opinion the 22s were a clear winner. I haven't heard the 60s, but others who have had both state that they are similar.