Ultimate Ears is an American custom in-ear monitor (IEM), speaker, and earphone manufacturer based in Irvine and Newark, California, United States. It was founded by Mindy and Jerry Harvey in 1995, who created a new market for custom IEMs now used by some of the world's top musicians.[3][4] In August 2008, it was acquired by Logitech and operates as a subsidiary.[5][6]