StacoHRP
Head-Fier
I know what you mean about the metallic timbre on hi hats and snare drums on the zs10 pro. For what it's worth it isn't there on the zsx. I can partially fix it with foam in the nozzles. Can't comment on the newer kz iems. I think it's caused by undampened ba drivers in the nozzle, but on the other hand I can't hear it as much in the original zs10.
But... Even with mods like foam or sponge, can't really dish out the metallic timbre on Balance Armature driver. It's there as it hallmark.
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