A hearing system includes at least one earpiece having a shell, an elongate retention element attached to the shell, and an insert unit. The shell has a sound tube portion carrying a soft tip for insertion into the user's ear canal, an outwardly oriented interface portion for detachably receiving the insert unit, and an engagement portion between the sound tube portion and the interface portion for engaging with the tragus/antitragus region of the ear, wherein the material and the dimensions of the retention element are such that the retention element can engage the user's concha by manual deformation by the user, and wherein the insert unit is a filter unit with at least one sound attenuation filter, or is an active electronic unit with at least a loudspeaker, and with an external electronic unit, which is worn on the user's body below the user's neck.