Nice detailed review! Got a question - how much of a difference do apex modules make in terms of relieving pressure build up for both 64 UIEMs and CIEMs?

I'm wondering if these are more comfortable than fully sealed IEMs for long sessions. Thanks

Great review, as always! You always provide a ton of information and photos, and it's much appreciated!

@dooxtypoox for me personally, the pressure build up is a function of how tight it the earcanal seal. I use larger size eartips for a more secure fit and better seal (improves bass as well). With some other iems I might have to take a break during long listening sessions, but in my experience with apex shells I never had that issue. A few friends of mine with tinnitus also mentioned it helps.

Cheers, thanks a bunch for sharing that