hello- brand new rookie here on this website. I have a Denon x3400H receiver and am looking for a good set of headphones ( movies, music = easy rock, instrumental , jazz). Have been unable to get confirmation on what the volts/amps/ Ohm's, etc. that the Denon is sending out of the head phone jack. Not interested in gettign a separate headphone amp. I prefer open back, open stage accurate headphones. Do not like boomy bass, or super tinny treble/cymbols. So pretty flat, not bright. Comfort is important = have tried Beyerdynamics 990 premium and pro's and they were good. But not sure about using them on my Denon. Maybe the 990 premium 600 ohm , or Seenheiser 600, or the massdrop 6XX. Options, opinions, and just info much appreciated.