In short: They sound really good for their price, however all the cables KZ provided (with mic, "upgrade cable" without mic or bluetooth cable) are miserable. Build quality is nice, earphones are however chunky. You should also try another eartip than those in box.
derzulyaYes, the cable must be replaced.
Tips must be replaced.
Now you will find yourself thinking.... maybe I should have just purchased higher tier iem which comes with better cable and tips...
But then again it is a hobby and gotta have them all