I have not heard the M50, just know about it's sound from the forums, the M60 has more than enough bass for music and I think would be acceptable for HT, if a sub is not desired, but there really is no substitute for a sub with HT. I think the M60 might sound the closest to the MA's, I have only listened to MA's in a store and the M60s in my own home, so take it FWIW.