Just wanted to give you my impressions about the Denon AH-D9200:
At first I didn't like the headphone nearly as much as originally anticipated and I was very close to selling it and getting a Focal Stellia. The Denon 9200 sounded to bright and lacked "soul". I came from an Focal Clear, which doesn't sound colored either, but wasn't nearly as bright as the Denon with my Denon DA-300USB AMP/DAC. I therfore upgraded to a Marantz HD-DAC1, which made the 9200 better but still not life-like sounding. Also the HD-DAC1 has that notorious Marantz mid-bump, which sounds pleasing at first but can get quite fatiguing after a while. The stereo image also was quite narrow, but better as with the Denon DA-300, more inline with what I remebered with my original Focal Clear+DA-300 combo.
Last month a friend of mine has bought himself a Cocktail Audio HA500H (also known as Novafidelity HA500H) for his Meze Empyrean and I had the chance to demo it with the Denon AH-D9200. OH MY GOD! What a difference! It literally blew my mind what abilities this headphone has when paired with a matching DAC/AMP! I really don't want to overhype a particular setup, as preferences tend to vary quite a bit. But this Combo is the endgame for me!
Very good stereo image (wide and deep), "airy" sound with no sharpness (with tubes engaged), brutally detailed and very fast+punchy while staying neutral!
After one evening at my friends house I ordered a HA500H.
It completly transformed my opinion of the Denon 9200, it is now my favourite headphone!
Headphones that I have also tested: Meze Empyrean, Focal Clear, HD 800 (stock), Fidelio X2, DT990 Pro 250 Ohm
Have a good one my friends and enjoy this masterpiece from Denon!
P.S.: I found the Meze quite lacking in punch/speed when compared to the Denon. Also the Denon is way less colored in sound signature compared to the Meze, making it a better match to the sound of the HA500H when tubes are engaged. Also it is way cheaper