EARPHONE

An earphone (10) comprising: an acoustic driver (116); a housing (16) containing the acoustic driver, the housing including a front chamber (114) acoustically coupled to the acoustic driver and a nozzle (126) acoustically coupled to the front chamber; and an ear interface comprising: a body (12) that fits beneath the tragus and anti-tragus and has a surface (13) that rests against the concha of a user's ear, an outlet (15) arranged to fit inside the user's ear canal entrance so as to seal it with minimal pressure, the outlet providing a passageway for conducting acoustic energy, and a positioning and retaining structure (20) terminating at an extremity (35) and arranged for contacting the antihelix of the user's ear along a length (40), the extremity contacting the base of the helix of the user's ear, wherein the nozzle fits inside the outlet and has a rigidity such that the passageway substantially retains a specified shape or volume.