Just tested mine and they sound ok. No need for equalizing so far. John Mayers voice sounds right, better than with zs6. Bass is prominent, but I like that. Changed the cable for the one that came with the ed16, less resistance compared to the zs7 cable. I have to let them run in and test some more but first impression is ok. (I understand that a 34 euro iem is not perfect and in the same league as an iem that has a zero extra behind the 34.) For the real trained ear and experienced collector of iems this could be not the best choice, for me it’s not perfect but good enough, especially for the money.Phase is fine from the outside. Lows are OK but I heard cleaner from KZ, voices sound kind of shouty and highs are uneven. Tracks with lots of cimbals will have some notes upfront and some almost missing. And there is drive flex, lots of it, not something light like IT01 but the kind that crackles at the slightest movement. As it is, ZS6 or even ED16 are better.
I'll have to open them when I get home to see if everything is wired right, maybe check the vent to see if I can fix the flex. Do other people get driver flex?
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