Hi Stealth owner,
due to a trade I got the opportunity to listen to a DCA stealth. I have it now for several days and wanted to share my impressions and maybe get some help.
Please be aware that I am very nitpicky and all critics are on a very high level. I think the DCA Stealth is a great headphone and probably the best closed back I have heard.
My general impressions are, that it is a very reference style headphone. It is dead neutral and measurements show that it has very low distortion. So if you want to know how things sound, I think the Stealth is the way to go. It could be really marketed as a reference headphone.
The bass is great, extends deep down, quite a bit more than all of my open backs. It is definitely enough quantity and a lots of quality.
The mids are very even, I personally like how vocals are represented. I'd say vocals are one of the very big strength of the Stealth.
The highs are sparkly and borderline harman tuned

I find them similar to the Susvara here, where some tracks can sound at the edge of harsh/sibilant. But never too much. But it is probably really an issue of the recording and not the headphone.
The detail retrieval is very good, I'd say quite on Susvara level but behind 1266 and Solitaire P.
The soundstage is very wide for a closed back.
Dynamics are fine, not on Focal level but nothing to complain.
Now to my points of criticism:
I don't find it to sound very coherent. I know that doesn't make sense as it is a single driver, but the subbass feels a bit slow at times (or makes the impression), paired with the well extended treble which sounds quite fast sometimes doesn't sound as one unit for me.
Additionally I feel like I can hear the metamaterial that is between the driver and my ear. The sound is a bit compressed. That really bothers me. I listen at very low volume most of the time, then it is very noticable. If I crank up the volume, the less noticable it gets (my loud listening levels are probably also very low for most of you). Or maybe it is just the nature of the closed back / reverb. I don't know exactly. But whatever it is it bothered me from the first time listened to it.
I tried using different positions but it did not change that issue. And I also do not get used to it. Is there a possibility to remove the meta material just to see if that's a thing?
Edit: If you encounter the same, check your setup. I had a phase issue.