The HD 650 definitely layers better than 600. Not a lot better, but it's an improvement. Dimensionality is about the same, although the 650 has marginally greater depth on account of its layering prowess.
My biggest qualms between the two after a few months are that I wish that the HD650 had the HD600's treble frequency response and I don't like the HD600 midrange peak. Can't decide whether I dislike that or the HD800 SDR 6khz peak more.
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