To be clear, I'm not just believer in burn in, I'm notorious practitioner of it. I'm yet to see IEM that was COMPLETELY UNAFFECTED by burn in (Or use over time). Even famous New Sony BA that is in ier-m9 required extensive one. First 3 days M9 was as described in one of the review having narrow sound stage and hump
@80hz. Was burning it in overnight and on day 3 soundstage started to open. Today It's one of the more open sounding iems I own.
All of that said, I cannot say that Roland changed that much to me due to burn in effect. I kept comparing Roland to LX and M9 and while both of them were notably brighter, that gap seem to have closed substantially and more often than not now when I switch from LX to Roland I don't hear improvement of clarity. I just get more distant vocals and guitar solo. Roland clearly outperforms LX now while 3 days ago LX was shining with extra sparkle in comparison

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If you asked me that question just this morning I could have said that Yes, LX is brighter, not anymore.

I have no idea What is going on here. Psichoacoustic Adaptation? Switching to M9 gives me more hot high end but ability to recognize and locate instruments is NOT better. I need more time to figure this out.

... OCD kicks in, makes me miss some sparkle but is it real detail or just self deception? While ago experiment was done: Vinyl Turntable recording loving Audiophiles were let to listen to 24/96 digital with some noise mixed to it and they said: "oh yes! now we talking!"....Perplexing