Paul, the recommendation is to do what you indicated in your previous post: you can consider a separate amplifier later if a problem develops. You're getting an excellent receiver in the 706, including plenty of power at 4 ohms for that part of the frequency range where the M80s are 4 ohms(for the majority of the range they're 8 ohms). It's got enough to do the job in the vast majority of home audio applications and you shouldn't spend any time(or money)at this point worrying that it might not do it for you.
