I was quite surprised with my M40's. I thought that they would be going back, for sure! My original intent was to get the M3's, but with the M40 being a M3-in-a-larger-box (and more $$$), I figured it would sound better with music. And they sound incredible!! For music, they ALMOST get low enough that you don't need a sub. I can only imagine what the 50/60/80 can do!!!