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18 Cards in this Set
- Front
- Back
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What does the term Loop unity gain mean?
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The point where a loudspeaker reinforcing sound and the sources levels are equal at the microphone capsals the feedback locks onto a frequency for which the loops path is in phase
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Name 3 things that factor into the potential for feedback?
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Speaker response, Microphone response and accoustic enviorment
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What does the term Equivelent Accoustic Distance refer to?
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distance of the closest listener estimate needed acoustic gain
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When is a sound system considered to be suffienct in providing adequete SPL without feeding back?
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When PAG is greater than or equal to NAG
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How does changing the distance between the source and the mic affect the acoustic gain?
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smaller distance = more gain; dis/2 = +6db
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how does the number of mics on stage affect acoustic gain
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more mics= less gain
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describe ways we can inprove gain before feedback?
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Use as few mics as practical
take advantage of mic directionality |
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What is electromagnetic interference?
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humm or buzz
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4 ways EMI is transmitted
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Common Impediace Coupling
Electric Field Coupling Magnetic field coupling |
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what are some ways we can reduce levels of EMI?
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Shields, Separation, Twisting figure 8/ Cross at 90
Fix pin 1 problem Balenced interconnection Isolation |
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Give two examples of Isolation?
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Transformer, Optical
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Explain how a balenced differential input is able to reduce EMI?
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Through common mode rejection
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What is the most common techincal system used for grounding in an audio system?
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isolated star ground
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Why is it dangerous to use an AC ground lift adapter?
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These devices disconnect the chassis
With no connection to ground a fault current would flow trough the first person to touch the device |
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What is the Pin 1 problem?
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XLR input and output pin 1 tied to circuit ground
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What is the maxium recomenbed length of an Unbalenced cable run?
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10ft
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what are the duties of a tour manager?
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person in charge of the tour,
take care of band and entourage, Oversee travel planning and lodging, Enforce contract |
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what are the duties of a Production Manager?
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our personal; sound, lights, stage, set, backline; euipment transportation;
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