I could be wrong but I think you might be feeling the W9+ vibrations. AFAIK BC vibrations are subsonic. Like I said, I could be completely wrong here. The only vibrations I'm feeling are in my face when the bass hits a certain way, I can almost feel it my chest, like real speakers. Again correct me if I'm wrong, but I don't think any other current IEM can do this. As good as bass might be with anything else, it's not EVO bass**.It depends on the volume and the amount of bass in a track. I really feel the whole casing vibrating in my hands when it’s playing a bass heavy track.
**Subjective opinion, not based on a test sample of 200 IEMs.