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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-

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. 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 high 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, 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 versions 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 µm. By comparison, this

distance is typically more than twice as large with other

condenser capsules.

The M 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.