How does the Aeon compare with the nighthawk ?
Well, the Aeons are the better pair of headphones hands down, but that doesn't mean I am going to sell the NightHawks.
The Aeon Open is much more neutral, much more balanced then the Hawks. Much more resolving and detailed. Imaging is superior. You can 'look into' the music deeper with better details.
The NightHawk has significantly more bass, especially mid bass, but it sounds muddy in comparison. AFO bass is tighter, punchier, much more controlled but also more linear and closer to neutral. Less quantity, more quality. Mids and treble on the AFO sound more open and clear. Again more linear and neutral compared to NH. The sound on the AFO is much more precise, but is leaner. Like putting a 4K telly next to a basic HD one. Switching to the NH immediately after the AFO (bad idea) the NH sounds almost like a toy. You suddenly loose focus, everything is cloudy and thick.
That said, the NH has its pros too. Once you gave your brain a few minutes to adjust, NH bass is so satisfying. I just like my bass quantity... Although the AFO bass is tight and puncy, the more bass on the NH sounds very dynamic and fun. Less controlled and detailed, but yummy. Like some liquid dark chocolate dessert.
On the one hand you loose all that exciting resolution and clarity of the AFO, but you gain much more thickness and fun. Mids and treble sound a little 'boxed in' on the NH right after the AFO. After a few minutes however you get used to it and it becomes full and rich and smooth and liquid.
Although the AFO is obviously the superior headphone after a while (1-2 hours) it can be a bit more tiring than the NH. All this resolution and details and preciseness is astonishing at first, but then it can be a little too much. The same way as most people wouldn't want to have a Lamborghini as a daily driver to work.
I personally also find the treble on the AFO slightly strong to my (very sensitive) ears after a while. It is a wonderful but a more 'demanding' listening experience after a couple of hours.
The NH on the other hand even with its shortcomings is like 'going home after a long day of work, sitting down in your plush arm chair and just relax' type of sound and experience. Yes, the bass is a bit out of control, mid bass is emphasised quite a bit, resolution is not great compared to the AFO, however the NH has the most relaxing sound, hugging your ears and soul with a warm, comfortable blanket. You don't have the slightest listening fatigue even after 4-5 hours. NH's sound is full, rich, warm, absolutely unique and is all about music. To be honest I think most of the time I would go for this latter listening experience. It is fun to drive a Lambo, but perhaps not all day. When I want to enjoy music, I want to relax and not have another wonderful but slightly tiring experience.
Both are wonderful headphones and amazing for what they are. Made for different purposes. IMO.
(NH also wins on comfort. AFO is more comfy than most headphones though, but NH is unbeatable here. After 1-2 hours I can feel the AFO on my head. Not uncomfortable just 'present'. While the NH basically disappears.)