Neumann.Berlin KM 54 User's Manual
Contents
1. pure nickel formed on top of a layer of copper foil using a galvanization meth od developed by Neumann The copper is then dis solved leaving a layer of nickel measuring only 0 7 u in thickness which is then attached to one of the rings surrounding the back plate electrode It would take 1 428 of these membranes layered one on top of the other to reach a thickness of 1 mm The results of this meticulous capsule con struction were exemplary frequency and polar char acteristics After the introduction of the KM 54 in 1954 it very quickly acquired an excel lent reputation as a voice microphone for radio and television It was used in many chambers of parlia ment and served at the lec tern of the United Nations General Assembly in New York It was equally suc cessful as a supporting mi crophone for musical re cordings The KM 54 was produced from 1954 to 1969 Thou sands of highly revered 54s are still in service today2. NEUMANN BERLIN gt gt THE MICROPHONE COMPANY KM 54 Miniature Microphone The KM 53 omnidirectional microphone was the first in Neu mann s family of miniature microphones A much desired sib ling for this family was a microphone with cardioid pickup char acteristic For this it was necessary to develop an entirely new capsule as the familiar existing cardioid models were far too large for a miniature microphone The illustration shows the capsule s painstaking construction In the diagram of the complete capsule above left one half of the membrane has been removed to expose the back plate electrode The diagrams in the bottom row show from left to right the back plate electrode with the contact spring in side rear view the delay plate the distance ring and the capsule holder with the rear sound inlets Above right we see the cover with a fine wire mesh in the middle The arrangement of the delay plate between the rear sound inlets and the back plate electrode forms an acoustic laby rinth Inside the capsule sound from behind the microphone is delayed just enough to reach the back side of the mem Charakteristiken Pra brane at the same instant that the sound travelling around the side strikes the front Ideally the resulting forces cancel at the mem brane and do not produce any output In this way a cardioid directional charac teristic is achieved The membrane of the KM 54 was made from
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