A Reinvention of a Classic Motion Picture Microphone
The KU4 is a redesign of the legendary RCA KU3A, a unidirectional microphone originally designed for boom use in Hollywood motion picture studios. It was RCA’s most expensive ribbon microphone and fewer than 600 units were ever manufactured.
The KU3A combined the smooth ribbon sound of the classic RCA 44 with a unidirectional pattern, a wide sweet spot, and reduced proximity bass boost. It expanded the engineer’s range of placement choices and became a standard at film studios throughout the world.
Today, the KU3A is a rare collector’s item and only a handful of studios or rental houses own them. Original KU3As are notorious for their sonic inconsistencies due to production tolerances that included the use of the thick hair of English cows as a damping material.
At AEA, we engineered our KU4 from the ground up in order to recreate this seminal design while ensuring flawless consistency from unit to unit.