The Matterhorn is a subwoofer model completed in March 2007 by Danley Sound Labs in Gainesville, Georgia after a U.S. military request for a loudspeaker that could project infrasonic waves over a distance. The machine has a combined amplifier output of 180 watts and its maximum playing frequency reaches 175kHz. As of May 2016, the Matterhorn remains the world's largest subwoofer according to Guinness World Records.