In 1959, an echo-chamber was famously used by Irving Townsend during the post production process of Miles Davis's 1959 album Kind of Blue. "[the effect of the echo chamber on Kind of Blue is] just a bit of sweetening. At 30th Street, a line was run from the mixing console down into a low-ceilinged, concrete basement room - about 12 by 15 feet in size - where we set up a speaker and a good omnidirectional microphone." [3]