I think i encounter a problem when comparing vented iems like gr07 and brainwavz M1 with closed ones like the Hisound crystal i am trying at the moment.
Their difference makes me feel that fully closed iems sound kind of congest. I switch back and forth from my gr07 which sound a lot more airy. Is this something that has to do with the venting holes? this is a disadvantage that all closed iems have? This means that custom iems are even worst? I feel like my ear has somekind of defence that srinks the ear canal making the sound congest? same effect when going to a club.
Thx for your time reading my question.