User's Manual

M 221
2
STUDIO CONDENSER MICROPHONE
APPLICATION
ACOUSTICAL SPECIFICATIONS
M 221 with omni directional pattern
The condenser microphone M 221 unifies universal small diaphragm capsule technology with a
metal diaphragm and a modular preamplifier. The use of a certificated measurement capsule
combined with a preamplifier with 48 V phantom powering reaches a constant magnitude and
phase response and transmission properties which are long-term stable.
Because of the small capsule dimensions the M 221 is ideally suited for applications where a low
interference with the sound field is demanded. It is usable as a main microphone for recordings
which should include a certain amount of the room response. As well the M 221 is suited as a spot
microphone for recording instruments very close where the low frequencies should be transmitted
in detail and original. Moreover it can be used for multichannel main microphone arrangements
like AB stereophony or decca tree. For these applications the microphone is ideal because of its
precise and long-time stable transmission properties. The M 221 has an excellent transient re-
sponse because of the pressure transducer capsule and is really suitable to record instruments
with extreme transients. With the both different sized spherical corpuses a high frequency accentu-
ation can be produced in an acoustical way to increase the presence and to compensate the high
frequency roll-off in the diffuse sound field. The M 221 can operate also in unfavorable climate
conditions especially referring the temperature and air humidity for which the accessory humidity
adaptor TA 202 is purchasable.
The pick-up pattern is equivalent to the longitudinal direction of the microphone. As sound trans-
ducer a condenser capsule with a diameter of 12,5 mm and a very thin metal diaphragm is used.
The pressure transducer capsule exhibits an omni-directional polar pattern without proximity
effect. Because of the free field equalization the M 221 has a constant frequency response from
20 Hz up to 20 kHz (± 2 dB). The static pressure equalization between the capsule interior and
the atmosphere goes through a vent to the preamplifier. Therefore the humidity adaptor TA 202 is
usable to protect the microphone in application with high air humidity. The use of the M 221 with
the spherical corpus KA 3 effects a frequency response accentuation which begins at approxima-
tely 1 kHz and goes constant at 3 dB from approximately 4 kHz up to 12 kHz. With the spherical
corpus KA 4 the accentuation of the high frequencies starts also at approximately 1 kHz and goes
constant at 3 dB between 3 kHz and 12 kHz.