My perspective on the Aeons may be a bit unusual due to my circumstances. I bought the units as a replacement for my aging Sony MDR-CD3000s, another highly-regarded closed-back set of cans which I purchased new back in 2000 or thereabouts for 400$.
A very familiar story
compared to the CD3ks, the soundstage feel 'smaller'. The CD3ks can feel like an open concert venue, but the Aeons sound more like a small venue for the same tracks. As far as I can tell, it seems to be tied to the extra high-frequency output from the CD3Ks, which make the whole thing sound more 'open'.
That's not good, well, not to my preferences at least. The CD3K are indeed super airy for closed cans, so I'd expect the Aeon to be able to surpass that. The sense of space from the CD3000 isn't just due to the grain and brightness, although that helps a bit for sure.
Soundstage is very improtant for me, so, that comment made me a bit worried about getting an Aegon without listening first.
The Aeons have significantly more bass than the CD3ks in my setup, with all EQ settings being equal. However, it isn't overpowering and doesn't muddle other details, something I noticed on the Sony MDR-Z7s.
To be fair, it's very easy to match the bass of the CD3000, especially after all these time when some drivers have already decayed and can even reveal some distortion in sub-bass.
Have you tried the Z1R? It's a different beast from the Z7, despite a few similarities.
As alluded to in the Soundstage section, the CD3ks seem to have more upper range detail. As I understand it they are considered 'treble cannons' so perhaps that's the manifestation of that. The Aeons still have good detail across the range, but I don't hear *everything* I could with the CD3ks with the same tracks, particularly with voices.
Treble cannons indeed, but still not the most revealing you can get these days. If the Aegon don't match the CD3K at that, I imagine what a comparison with an HD800 would show.
4. Comfort
The CD3ks and Aeons take drastically different approaches to comfort. The CD3ks used a spring-loaded suspension strap and minimal clamp, which meant they were very comfortable for long periods. Additionally, the earcup interiors were angled to the users ears, so they had a lot of room inside the cups. The Aeons use a friction-locked strap with what feels like a lot of clamp in comparison. I imagine this is partially to fully seat the pads on the head and reduce leakage, but it has required some adjusting on my part. Both cans are quite comfortable, but feel different at the same time.
Won't comment on this one to avoid repeating myself, but I think I've found the 10/10 headphone in terms of comfort. It will be difficult to surpass it. If the Aegon matches the CD3000, then it's not too bad.
Overall, I'm happy with the Aeons, but I am slightly dissapointed in that I had hoped they would blow the CD3ks out of the water, rather than being 'just' as good. I know that is an awfully high bar, but again, I can only compare it to what I know. I was really hoping 20+ years of technology would have allowed for significant audio improvements, but no such luck it seems. None of that is MrSpeaker's fault at all, and it is very impressive that a comparatively small group was able to match something made by a keiretsu behemoth in its prime.
Matching the CD3000 isn't easy, even these days. They're flawed but really good in some ways, and definitely a headphone that one can own for a couple of decades, getting a very impactful impression from it.
I have replaced mine with some sort of hybrid, the HD800+Z1R.