I can definitely agree with this one. Rah was really difficult for me under 120 hours or so. There was even a measurable volume difference between right and left side at around 80 hours, of 3db. After 20-30 hours of more burn-in this difference got reduced to around 0.5db, which is normal.Haha Whoops!
Its very interesting. There has never been such a consistent consensus of people all agreeing that burn in real and clear with IMR IEM's, even folks who previously swore blind it was not a thing!
The RAH sounds phenomenal now after about 170 hours but it went through a horrible patch from around 25 hours up until about 80 hours.
The RAH is such a prefect compliment to the OPUS - one with planar and one with electrostat! Like brother & sister - both different but related
Proved to me once and for all that burn-in exists.
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