I honestly don't hear EXT bass as slow. Maybe not as fast as a BA driver, but I wouldn't call it slow. Maybe the faster attack and decay compared to Z1R just makes it sound faster, not sure,
@Deezel177 would probably have a better handle on the specifics here. I'm with you on EXT being one of the more technical IEMs I've heard - not as in brilliant technicalities (they're still very good), but technical sounding. Clinical is too hard a word, which is why I called it dry. As for fit, after more than a week of in-and-out AB listening, my ears feel like they're in an abusive relationship with EXT...
If you mean with EXT, I just don't hear it that way. Have you heard Z1R? EXT does have more of a midbass focus to it though.
Heh, I actually find Z1R very comfortable. EXT onthe other hand...it's ok, as long as I leave it be. If I take it in and out a few times, my ears start burning.