AmericanSpirit
Member of the Trade: Night Oblivion
I've been listening to my SR5 for a week. It sounds a little too bright (?) to me, or maybe something with the treble region, makes it fatiguing at times. Is it just me, or do you guys notice similar characteristics?
I've tried a few tips: final e, spinfit cp145&w1, azla xelastec, feaulle h570, fiio hs18. No luck.

There are two possibilities first is upper mid fatigue which is cause by 3hz, which is less likely when compared to definition fatigue around 7-8khz. And this is the main reason you see some kind of dip around 5-7khz for almost all IEMs.
95% of people has pinna gain from 2.5khz to 3.5khz, and they likely to feel fatigue from 5khz-7khz.
I’m suspecting you are sensitive to 7khz level.
You may try Final E tips which tames that area. You can search “Final Audio Design E500” that entry level bullet IEM is pretty neutral and comes with full set of final E tips.
If you still feel fatiguing, you may consider JUZEAR 41T, treble energy is lower than SR5

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