Drew, the amount of watts that the M60s would draw in that use depends on the loudness of the material being played at a particular instant, the same as any other speakers. At a comfortably loud average level 1 watt, or a bit less, would be used; brief peaks would use much more of course, depending on how wide the dynamic range of the material being played was. As was said before, there's no good reason to assume a problem and spend money to solve it when it may never develop. Your 2600 is quite powerful as an amplifier.
