I must have HUGE ear canals, because with the large silicone tips provided in the box, I got a perfect fit with an impeccable seal! Now i simply get the most amazing sounds ever from an IEM i've owned, and i've owned MANY! I must amend to say that the simply stellar sound quality extends to FLAC (lossless) sources. The TF 10's tend to struggle a bit with mp3's. Even the 320 and V0 quality files. You lose about 10-20% of the sound stage and depth with mp3 files. Still....worth every penny, and I must laugh at those who complain about it being a bad...