Why do you think 3.5 TRS has more natural tonality? Maybe it's feature of your DAC/DAP?This is why I prefer 3.5mm single ended for a more natural tonality & timbre; furthermore, with this specific IEM I don't ever exceed the 60% volume threshmark for the reason because I'm treble sensitive.
I'm wary of 60% volume because it's almost at the limit before the amp's distortion. In such cases, I increase the gain.
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