JH, my suggestion is that even now the M60s should be set "small". Although they do a pretty good job in the lowest bass, your EP500 does even better there and should be given the responsibility, while relieving the M60s of some of the load(which should allow them to play a little cleaner on the higher frequencies). Even with the new Onkyo, which will have more flexible settings available, I'd still suggest setting everything small with an 80Hz crossover.

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Enjoy the music, not the equipment.