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Wide, flat other than upper treble.
I will update this review later, but my first impressions are a wide stage, although my dt990s have deeper stage I think. Anyways the first thing I did is eq the treble down -6db for 16khz and -3db to make them unsibilant at higher volumes. My dt990s have really great imaging and wide and deep stage, but I'm starting to notice some background details on songs that only appear on the He5xx. I agree with other people that they are best suited for music that isn't too busy like edm? I found them best on rock because of the midrange details. I haven't gotten them to sound right on edm, ill report back after burn-in.
They don't sound like Sivga Phoenix at all, to me they have none of the dynamics detail that is super immersive. Instead they use the deep and dense stage to fill the headspace. My dt990s have a deeper stage but it makes them feel distant sometimes. Even more airy than the He5xx so far, but they do share the upper treble boost it, although the treble flavor sounds completely different.
Whereas the dt990s have just really good and deep stage that gives instrument separation, the He5xx is a little different because it brings out layers of the song that get lost.
Some reviews said that the bass scales with whatever genre you're listening to, and I'd have to agree. When I turned up 40hz or 60hz, it would sound good with rock, but then in edm there was too much bass all the sudden. The good side is that without eq, the effect lines up well most of the time.
Testing has been done so far just using Geshelli balanced stack and Tidal.
Would recommend to a friend.