Hi,   So I got my HD600's back on 1st of April when Play had that sale.   I feel they are broken in now and comparing them to my HD590's on my AudioTailor Jade and my various home made amps (mostly hybrid designs) I can safely say that they have 'more sparkle' 'higher resolution' and...

Yes I know these questions have been asked to death, and I am truly sorry. I am seeking a recommendation for a closed cup headphone to be used for long periods of time listening at work, in a NOC on what will probably end up being the Audio8 simple hybrid amplifier fed from a simple USB DAC...