Personally, I think the above two items are unnecessary. On the whole, A900X is one grade behind ZK, and the style and overall quality of A 1000X are also very close to ZK, which are all fresh and analytical headphones. A 1000X is smoother and ZK is more straightforward. I think W series is more worthy of consideration, and we can't give up W series just because of ESW9. The quality of ESW9 can't be compared with the mainstream models of W series. Why not look at the Z7? Far from ZK's style.