The Wall of Sound was built exclusively for the Grateful Dead and it was used on their tours from 1974 to 1976.
GratefulDead Wall of Sound Specs
26,400 watts of continuous power via 44 Mclntosh amplifiers
586 JBL loudspeakers (15", 12" and 5")
54 Electrovoice tweeters
75 tons in weight (approximately)