 During the disco era, sound engineers aimed to create a more powerful, deep bass sound in dance clubs and nightclubs.A key approach used by engineers to get heavier, deeper bass sound was to add huge subwoofer cabinets to reproduce the sub-bass frequencies.The Paradise Garage discotheque in New York City, which operated from 1977 to 1987, had "custom designed 'sub-bass' speakers" developed by Alex Rosner's disciple, sound engineer Richard ("Dick") Long  that were called "Levan Horns" (in honor of resident DJ Larry Levan).