Warning: Spoiler! (Click to show)
As far as I know, your ear canals are too small to accommodate three sound tubes but origination is still from three except it is merged. I know a few people that only have two bores in their FitEar customs and they are all enjoying them very much.
You can also forget about the SR mod on your pair as I think one of the requirements was for there to be three sound tubes.
Thanks! That's the most likely explanation. No matter, as I still think it sounds terrific!
Come to think of it, I remember Derek telling something similar but didn't seriously look into it. Goodbye SR mod...
Edited by eargo - 6/8/14 at 2:24am