There are two ranges people can be sensitive to. Either the upper-mids or treble.
I'm more sensitive to upper midrange, so it does make sense why the T1.2 is a bit easier on my ears. I've heard a few different T1.2's, one was dramatically brighter which made it sound hazy to me, hated that one, bright headphones often come across as a bit hazy to my ears some reason.
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