The EX800 and the KPE are totally different IEMs IMO.
KPE has this liquid, slightly slow sound with emphasis on sub bass and (upper) mids, EX800 has a very flat lower frequency with much more speed/dynamics, clarity and detail, but less sub-bass, mids are not as forward as on the KPE and treble is more clear and pronounced as well. At low volume a very clear presentation, at high volume it's getting a little intense in treble. The huge back vent makes it sound very open in terms of soundstage.
Look at graphs, they show some of that
I received ex800st 2 days ago, i didn't do a direct comparison with Kpe, from the first 3 hours of listening i kinda agree with this but from what i remember i feel the kpe has more clarity and slightly bigger soundstage (may be because iam using KPE with a balanced cable) ,on the other hand i have to add ex800 is warmer with a fuller sound and has more weight in the mids and vocals, and the treble can get slightly hotter than kpe but nothing extreme for me at least.
i definitely enjoy them both, i need to get some balanced cable for ex800st (if there are any recommendations) and also give it some time to burn.
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