'suction' when you pull them out due to the seal. So should I be getting used to the Large or is Medium right? If I'm going to spend, a frankly ridiculous, 15-20 on tips then I want to make sure I'm buying the right size! So I'm interested in your experience of in-ear headphones and how comfortable/well fitted they are It sounds like large is the right size for you. Bass response with iem's is largely based on the premise that tip seals with your ear. An even better (but more more expensive) solution, is to get some custom-moulded tips. I bit the bullet last year and they're fantastic.