I can relate to this thread.I purchased a pair of m60s in Nov,which I enjoy very much,but when I bought them I also bought a Yamaha RX-797 made just for stereo listening,but when I listen to my M60s I have to turn the treble all the way up to hear any crisp highs.when the Yamaha is in the neutral postion it really muffles the m60s.I am just curious is it a common problem with Yamaha products?