Hi Sunny,
I have a question. I did some more testing, this time while being active. When my head is in its natural position, i.e., slightly bended forward, the seal is good, very easily noticeable through the plenty of bass. However, when I move my head backwards slightly past vertical, or of I lay horizontally, the seal gets lost. I notice by the feel that my skin disconnects from the CIEMS, and the bass vanishes. I repeated this experience many times. It is reversible too, so if I tilt my head forward again, the seal is restored. So my question is: is this normal, is the seal "fragile" and only good in one position, or is it supposed to stay in all/most head positions ? Let me know if you need me to do some more testing.
Thanks,
Sebastien