AKG C 391B Bedienungshinweise Seite 12

The C 391 B is delivered with the following modules and
accessories:
• SE 300 B powering/output module
• CK 91 unidirectional microphone capsule with cardioid response
• W 90 foam-type windscreen
• SA 40 "quick release" stand adapter
The microphone features extremely low handling noise due to the low-
mass diaphragm and smooth body finish, low r.f. interference due to
screening- and filtering technique, and will work under almost any
condition due to the conservative and reliable design.
The switchable attenuation of the output level by 10 dB is especially
useful in connection with high sound pressure levels (when used in
close proximity to high-energy sound sources) and using input stages
of amplifiers or mixing desks with limited input level capabilities. Other-
wise, this associated equipment will overload before the maximum
overload point of the microphone has been reached. The incorporated
bass-cut filter reduces the risk of distortion at low frequencies. This
feature ist especially useful in combating wind noise or stage floor
vibration. The slope of the bass-cut filter is about 12 dB/octave with the
cut-off point at about 75 Hz.
Changing Modules:
All capsules may be attached to the powering module via a bayonet
connection. Consequently, a quick, safe, and easy change of modules
even in dark rooms may be made.
The capsules or accessory modules fit to the powering module in only
one position. Once the two parts are put together only a short right-hand
twist is required until the modul "clicks" into position (see figs. 2a, 2b).
The capsule modules may be taken off from the powering module with
a left-hand twist.
Fig. 2a Fig. 2b
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