By John Vasey
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Additional resources for Concert Sound and Lighting Systems, Third Edition
Example text
Wire ropes should be checked for any broken strands, because once one strand goes, the rest can easily follow. Do not use kinked wires. Do not use any piece of rigging equipment that does not 15 16 CONCERT SOUND AND LIGHTING SYSTEMS Figure 3-1. position. A bridled point. Bridling often is necessary to place the points in optimum look up to par. Hessian sacks can be used to protect slings from the rough edges of roof beams. The desired position of the point should be chalked on the floor as a circle with an X in it about a foot wide, making it easy for the riggers to see it from the roof.
ANALYZING SPEAKER SYSTEMS A spectrum analyzer is used to measure the entire spectrum of sound as a person hears it and displays it on a series of light-emitting diodes (LEDs) that match the layout of a graphic equalizer. Analyzer response must be set to suit each application. For reading a musical program, fast attack and slow decay are suitable; for acoustic measurements with pink noise, slow attack and slow decay are best. Divisions of the audio spectrum are shown in Figure 4-2. Phk NoisE To measure the performance of a speaker system with an analyzer, a source of sound, pink noise, is required.
Forcing the connection can damage the connectors and pins. The most suitable type of pins are gold coated and do not tarnish (Figures 6-1 and 6-2). When a microphone is connected to the FOH console and the monitor console through the multicore system, it lowers the input gain. If the line is disconnected from one of the consoles, gain increases to the console that 39 40 CONCERT SOUND AND LIGHTING SYSTEMS MIC/DI MONITOR INPUT BOX 3 FOM DESK INSERTS 0 c CROSSOVERS I n SPEAKERS Figure 6-1. LIMITERS I 8 SPEAKERS Sound system signal path.