Reminds me of the old days here when
@Slater was still around (mod in peace, bro) and he and some other nerds here were modding the living cr@p out of those KZ, CCA, TRN, BLON, etc..., including 'inside jobs' ... opening them up, dampening individual drivers, etc...
Not for everyone but OTOH no rocket science either. Even though I'm not much of a fan of xy-brids, if the pos. reviews on the Pro 2 keep coming in I might get a pair myself and see what can be done IF the upper midrange somewhere around that prominent 3k peak needs some work ... might be worth it.
The good 'ol ZS6 ... after some mods (cotton tubes, blue tack dots on new steel meshes, mesh filter on one of the treble BAs) they've been my daily bangers on public transport for quite some time ... I still own 4 sets, lol.
Once I'm at it ... something that might have escaped some folks is that there are 2 versions of the ZS6 (that have been discussed quite a bit back then). The first batch(es) sport some spicy older Bellsing BA for the treble that some folks here didn't like too much but at some point KZ switched to new custom Bellsings and while that helped a bit to tame the hot trebles some modders here, myself included, preferred the spicier OG version (with some quick and dirty mods, see above).
Can't please everyone, but at least they keep trying