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148 The Audio-Visual Handbook
orchestra, chorus, quartet, or individual musician may enter into a contest against the performance of any other group or individual by using recordings. This procedure has been used effectively in debate work for many years and is now becoming common in musical performances.
The most modern recording instruments are simple to operate, reliable in performance, and require very little attention to keep them in first-class condition. Any teacher can soon learn to make excellent recordings. One necessary precautionary measure is to place the recorder in a room where it is protected from extraneous sounds or vibration, as a good recorder will record all sound which reaches the microphone.
Sound Amplification or Re-Enforcing
The problem of providing sufficient sound to reach all corners of an auditorium or other space with clearness has confronted individuals and groups since the time when the Roman senators were elevated to their lofty positions largely because of the stentorian qualities of their voices. It is no longer necessary for the individual or group to endure unusual stress and strain in order to reach the ears of the audience, regardless of the size of that audience. Simply operated sound-amplifying equipment makes it possible for the person or group to perform at normal speech or sound levels and have that performance amplified to reach any audience.
The required equipment may range from a small portable amplifying or public-address system costing less than $100 to an elaborate arrangement of amplification and speakers which will accommodate any audience or type of program. A portable public-address unit capable of re-enforcing sound to accommodate an audience of 2500 to 3500 persons may be purchased for less than $200. Equipment of this type may be used in the school auditorium, in the gymnasium, on the athletic field, or on the school playground with equally satisfactory results. One will recognize at once the value of being able to amplify sound in any or all of these instances.
The majority of the portable and stationary sound-amplifying equipments are so arranged that they may be used to reproduce and reenforce music or speech which has been recorded on phonograph records. A simple record-playing device, costing less than $20, may be attached to the sound system for this purpose. Similarly, it is possible to amplify radio reception with the same type of equipment, if the receiving set does not have sufficient volume to accommodate the