That is the common perception of the HD650...but I did not find that to be the case at all....with the right chain it is a great can....just not a lot of air up top....I sure would not call them veiled or un- dynamic at all.
They're significantly slower than the HD600. I feel rather the HD650 are rather "lifeless" on tracks like Only If for a Night (Florence + The Machine). They're too laid back, it's feel like they drag the song down, especially in comparison to the Grados. On the other hands, I like the HD650 on slow, jazz-y Vocal tracks.