Ultimate Ears is an American custom in-ear monitor (IEM), speaker, and earphone manufacturer based in Irvine and Newark, California, United States.

Drummer Alex Van Halen had great difficulty hearing the other band members over all the noise of the stage; louder monitors did not help.

[8] Pop singer Engelbert Humperdinck wanted a set and at that point Harvey determined to start a company to supply the demand.

[8] Harvey and his wife Mindy decided to divorce at the same time as they joined as business partners in Las Vegas, Nevada, where they incorporated Ultimate Ears.

"[8] The company was run from Mindy's home, offering not just custom-molded earpieces but the associated radio transmitters and receivers intended for use onstage by performing musicians.

Customers included The Rolling Stones, Faith Hill, Enrique Iglesias, and the Red Hot Chili Peppers.

[8] Innovate Partners helped Ultimate Ears develop a manufacturing source in China to provide the expected volume of sales.

By April 2005, the resulting Super.fi 5 Pro, a double armature product, was offered to consumers at $250 per pair, and sales of these helped Ultimate Ears to gross more than $10 million in 2006.

[11] Logitech's vice president in charge of headsets and earbuds, Philippe Depallens, said that even after the departure of both Jerry and Mindy Harvey, the company has been able to "keep carrying the torch of having the best in-ear monitors in the market.