IEMs fit inside the ear canal, giving excellent noise isolation even in the noisiest of environments such as a concert stage.
In-ear monitors, or IEMs, are special earphones used by modern touring musicians. These are called in-ear monitors (IEMs), and while they aren’t used by a huge chunk of the DJ population, the few who do swear by them because they offer noise isolation and monitoring consistency that lie beyond the reach of standard DJ headphones. You may have come across DJs who spin without headphones, opting instead for what look like earphones.
