As an old HD565 owner and 650 owner , I can say, 565 is warmer and natural than 650 when it coems to avarage amplifier (without ampli they are almost nothing!) Even though I can say in avarage amplifier that I built it HD565 Ovation is great headphone, you can be dissapointed after upgrade HD600...

I am just listening to AKG K317 , (equipment : ipod video 60GB) nad it is nice as far. By comparison with Senn MX500 and MX760 ,I can say tehy are different in class, AKG more closer to Hi End. As an old fan of Sennheiser I can say some differences according to my taste, taste ? because...