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An omnidirectional microplione i8 appropriate also for a panel presentation with members seated approximately the same distance from the microphone. If the panel is spread out along a long table, individual unidirectional microphones attached to a mixer is the best solution. At right is an omnidirectional, miniaturized dynamic mic, shown with a pedestal for use as depicted at left, or for lavalier mounting.
3. Mounting accessories available include desk, podium, floor stand and boom units. Where platform or other vibration situations occur, a shock mount is recommended.
4. It is recommended that microphone cables in varying lengths be stocked to meet changing conditions of use. These cables should be equipp)ed to connect from one to another by means of plugs and jacks that have metal shells to prevent damage from traffic. Also, short lengths of cable with conversion plugs and jacks are useful to adapt to various microphones.
5. In some instances it is necessary to use multiple microphones to pick up inputs from several sources (as a panel discussion or with an orchestra). Resistance mixer units are not efficient for this purpose since they attenuate the signals. Miniaturized and transistorized units are available as plug-in components for this purpose, or the larger amplified counterparts can be used to balance and mix the multiple inputs.
6. For stereo recording purposes it is desirable to pur
chase matched microphones to permit desirable balance of the inputs.
7. Several varieties of "wireless" microphones are now on the market. Such devices enable the performer to wear the mic and a miniature transmitter. This eliminates the trailing connecting wire and permits unhampered motion. The signals are picked up by a receiver unit and then fed into the P.A. or amplifier.
8. Another recent product is the portable and selfpowered public address system. One variety is nc larger than a drinking glass, but contains the microphone, amplifier and speaker in a case wit! a total weight of 11 ounces. Another approach the six-pound case that opens into a podium and contains the battery-operated P.A. Such items are handy where local setups might require undue tim« and effort to set up temporary facilities.
Photos courtesy ElectroVoice, Inc.
typical microphone pickup patterns
Omnidirectional (non-directional) pickup pattern covers a 360-degree area around microphone.
Bidirectional microphone pattern picks up from two sides.
Unidirectional (cardioid type) has heart-shaped pickup pattern from one side of mic.
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