High end for their ability to scale the ladder. Using a Zana Deux as preamp into a B22 and I'm stunned by the speed and tactility of this headphone. It may even be too quick for Wes Montgomery's guitar! Just got my 007mk1, my last attempt to dethrone the HD650's for small ensemble jazz. If that doesn't do it then I'll give up completely.
Hmm, I just can't seem to get what I want out of my HD650, particularly at the high end. Am I not feeding it enough? Losslesss from a PC through an AudioQuest Dragonfly DAC/amp ...... and THAT seems to sound better than if I put an Objective2 amp after the DF.