@Erikdayo was kind enough to lend me the ADX-5000 for impressions and measurements. I originally heard this at last years RMAF and wrote it off but my impressions were influenced by a cold and blocked ears. This will be a stream of consciousness review: The packaging was pretty robust with an outer brown box, inner box with sleeve and a cutout for the leather case with headphones and accessories. The headphones are VERY light, like not wearing anything light. I was careful handling them as the headband seem fragile, at least from appearance. Cable is very microphonic, single ended only. Sonic impressions pre-measurements: Sound similar to HD800, very clear expansive sound stage Treble smoother than HD800 (no 6k peak) but just as present or about the same quantity Some excess energy above 5kHz, probably a peak or elevated around 8kHz Mid bass covers up some details but not overbearing lower treble is recessed similarly to HD800 Voices are sometimes pushed too far back in the mix Percussion is rendered very nicely but with some extra splash and air They can get tiring on a very neutral setup Tubes pair very well with them, take the treble edge off Sound stage is very open, deep and wide Channel matching is fantastic! I would get some distortion with the right driver with sub bass heavy songs, note the elevated distortion below 30Hz: Something to note, that dip ~5kHz is a measurement artifact, the CSDs show a more complete picture, here is a CSD at a better angle: A couple headphone comparisons... ADX5000 vs HD800SDR w foam mod and HD800SDR w Anax? mod: ADX5000 vs Utopia: I did try a couple pad swaps, none were note-worthy. There are some funky artifacts that show up with alternate pads. Audio-Technica did a good job of taming the drivers to achieve the result they have. I enjoyed these quite a bit with the Holo Spring and Aficionado.