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Stands for in-ear monitor. A type of earphone that inserts deep into one's ear. Can be either dynamic driver, or balanced armature-driven. They have a tendancy for great isolation without the need for active noise-cancellation
Tom: Wow these Shure 535s sound great!

*gets hit by bus*

Jude: Damn, those must've been some great IEMs
by AndrewBronard October 05, 2013
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