If you look at the tubing with just the UE tip on the IEM it surround the tubing (has more room). Although the sound will still be changed in some way due to the tips shape (the tips tubing is still surrounding the IEMs tubing. But using the Sony tips focuses it more (the tubing isn't as open and it has a curve inside it's own tubing). That all affects the sound plus the bends in our own ears as well as fit will play a roll on this. I guess I can't say the tubing of the hybrid is obstructing the IEMs tubing per see but it is altering the sound as it's tubing leaves less space for the sound to funnel through. At least in my case the bass is more elevated and not in a preferable way. On the 3rd ANV it makes it bassy which is usually a term I don't associate with hisound... Now regarding the sound staging I don't really see it as taking much of a hit. It does seem a little smaller for me but not by much.
Edited by lee730 - 4/21/13 at 12:37am