I prefere my high ohm dynamics paired with my Beyerdynamic A20 (100 ohm output) or my high z OTL. Imo the HD800 and HD600 benefits from a higher z amp. Slightly elevates the bass and makes the sound less fatiguing because of the lower damping factor. Very nice with slower music genres like female vocal jazz etc. It's a personal preference thing, but if you listen to a lot electronic music, it may not be ideal with a low damping factor.