Let me remind everyone that ZS3 is one of the most inconsistent KZ IEM due to their shrink-tube driver nozzle inside shells. I agree that ZS3 has recessed trebles (B9S found them better than ATE/ATR, which to me is mystery! I don`t agree at all) but treble/highs are like needles in ears sometimes with both units I have. To me and with my gear ZS3 is clear typical consumer V-shaped IEM with recessed mids and loose "boomy" bass, even noticeable with slater mod. ZST is quite W-shaped imo. Nice punchy detailed bass but highs are somewhat harsh because of peak. With wide-bore tips and removed nozzle mesh it becomes little better. I found best tips to be widebore Auvio S size. I hope it will be KZs first graphene driver! But I doubt it. So, it is actually called ZS10 ? I also hope it will be max around 50$, otherwise they really need to stand up against Tinaudio T2 and some others with higher price tag. Why I think it will be actually under 50$ (at least in the end) - I got ZS5v1 (which is 4 driver per side) for 36$ (22$ with discount) when it launched and now goes uner 16$. And I doubt they will tune the crossover so well that ppl will run storm about them.