In-ear monitors offer many advantages for musicians on stage. Earphones allow musicians to hear their own mix. In-ear monitors use transmitter and wireless receiver.
What are In-ear monitors, their benefits, and why do singers wear them? - MTT - Music Think Tank
3DME Custom Tour Gen2 Music Enhancement IEM System
The Drummers Evolution: Transforming Drumming with In-Ear Monitors with Ciara Chinniah - Drummer's Review
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An Introduction To In-ear Monitoring