yeb Andro is much more sensitive, i ordered iematch anw, just in case having sensitive iem in the future.My ears are really sensitive, once i hear the hiss, the hiss will bother me till the end. I have iematch for any of those cases. My andros back then is worse than your z1r for sure lol
Beside that, xCan is so wonderfull. It's 3D+ improves Z1R's soundstage (and layers, details) so much to the point i have to admit i wow many times from all of my old songs.