Koss's miniature portable earphone, affectionately dubbed "The Plug," makes use of an ear-cushion material (similar to that used in sound-blocking earplugs) that slowly expands in your ear canal to provide a custom fit and maximum sonic isolation from external noises. A detachable, extrawide headband makes these Koss-termed "stereophones" easy to carry or store. For...
“*Please ignore the audio quality / comfort / design / isolation / value sliders for this review. As far as I can tell, they seem broken* This is a universal in-ear monitor with a two balanced armature drivers and a dynamic driver. This earphone costs $1250 IEM with a cable that costs about $800, or as a package together, about $1400. I'm part of an Australian listening tour for this...” --a_recording