Thanks for your fast response.
I think I prefer a V shape sound, buy I don't care if the IEMs are all-terrain, and play a little with the equalizer. I want good IEM for a long time and try to hear things I never heard before with my actual ear/headphones.
I was thinking in the latest KZ ZS10 but if ES4 or ZSN are good enough for me, I have no problem buying them. Also maybe I need a better cable and tips
EDIT: I'll use iPhone Xs Max as source and I prefer BT module for most of the time
if you like to hear everything that you never heard with the ZS3 id say go with the trn V80, its non-kz but its a very good iem that is very sensitive & detailed with its stock cable, its a bit expensive compared to the es4 & zsn but its worth it, the iem feels like it adjust itself to the music, though if you're used to v-shaped it will sound weird when you use it for the first time.
now im not sure if this applies to everyone but the es4 gives me a bit of asmr feeling the first month im using it, because some music sounds so close/intimate or playing just behind me that it makes me feel weirdly good, id say its a "relaxing" iem to listen, compared to the zsn at least, it sounds more balanced & laid back making all sounds feel on the same level apart from a small treble boost.
i need some time to appreciate the zsn because im not a huge fan of forward signature, but now that it has settled, its a very vocal focused iem, makes you feel intimate to the singer or the lead instrument though high volume listening might hurt your ears a bit
and since you prefer to use a BT module, i recommend get the trn bt20 module,its expensive but its also TWS & works well for either kz or trn models (or anything with 2x0.75mm pin)
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