IMO, the M60s sound best for music if set to large. Whether a sub is attached or not has nothing to do with their sound. (not considering the crossover) They go low enough on their own, that for most music they are fine without a sub. But if you like that little extra "oomph", a sub can make them sound better. That is where I wish I could set them up the way I want. (large/sub out) I often just play music through the fronts. When I want that "oomph" I just change the setting to have the bass to go to the speakers and the sub. That doesn't sound bad, I would just like the option to at least set it anyway I want. For HT, with fronts set to large, sub out, it does send the low freq to the sub, so I wonder why not for 2 channel music. It's really not that big of a deal. And like I said before, it doesn't affect the sound of the mains. Unless you set them to small, which I feel they lose some of their fullness then.
