M50-history电路图.pdf

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1、neumann.berlin the microphone company M 50 The Historic Omni Directional At the same time as Neumann launched the M 49, the first remotely controlled microphone, Neumann also introduced a new omni directional microphone, model M 50. This mi- crophone distinguished itself by not merely using a pres-

2、sure transducer as its pickup, but also by mounting this capsule in a spherical body with the diaphragm flush with the surface of the sphere. Unlike a conventional cylinder shaped omni directional microphone, the arrangement of the capsule and sphere provides a different behavior in the sound field.

3、 As result the microphone has a very smooth frequency response to above 1000 Hz with a gradual rise reaching +6 dB from 8000 to 16000 Hz. Simultaneously, the directional characteristic shows an increasing directiv- ity toward the higher fre- quencies. The unique fea- ture of the microphone is its hi

4、gh frequency directiv- ity, similar to that of a pres- sure gradient type, com- bined with the linear re- sponse at low frequencies, well known for pressure mi- crophones. Mechanically the M 50 is constructed like its sibling model M 49. The amplifier is elastically mounted on a solid rubber plate,

5、while the microphone capsule is mounted in its Plexiglas sphere on the plastic ampli- fier cover via an elastic sus- pension. As the active ele- ment a Telefunken triode of the type AC 701 (k) is used. Originally the microphone capsule was equipped with a highly stretched aluminum diaphragm, later v

6、ersions employ gold sputtered polyester foil. In order to achieve a high sensitivity and low equiva- lent noise level, the separation between diaphragm and elec- trode is an extremely narrow 10 m. By comparison, this distance is typically more than twice as large with other condenser capsules. The M

7、 50 microphone was very quickly accepted as the high quality microphone for all classical recordings, as spot microphone for woodwinds and brass, but also for strings. An interesting experience was reported from a recording studio in Berlin, where two M 50s were placed as spot mi- crophones in front of a violoncello at a distance of 2,5 m. The optimum sound was achieved with both microphones turned off axis by approximately 15. Thus the directivity of the M 50 was used as a sound defining element. RadioFans.CN 收音机爱 好者资料库