Thanks for the reply. I have the volume in i-tunes at max but the volume in windows fairly low. I use a variety of file compression rates. Some 192mp3, 256 AAC, 320AAC and Apple lossless. They all seem to have the same problem. The vocals and higher frequencies sound 'rough'. The best way to describe it would be as if 'when taping a lp onto a cassette and the recording level was set too high and saturated the tape'. I have tried both wireless and wired. I have not tried using a optical cable into my amp though. The songs sound great through headphones on my Touch and through my Denon dock.