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JATC 3rd Year - Midterm > sound reinforcement > Flashcards

sound reinforcement Flashcards

1
Q

with respect to cabling, magnetic fields are only canceled by two things. what are they

A

shielding, twisting

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2
Q

condenser microphone

A

voltage 9 and 48 volts applied to diaphragm
responsive and quality sound
slightly more sensitive to environmental factors

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3
Q

what causes hum

A

leakage of AC power:

  • poorly isolated power transformer
  • power supply issue
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4
Q

a loudspeakers sensitivity rating denotes what

A

efficiency of speaker. power in to energy out

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5
Q

what type of cables should be kept to 10 ft or less in length

A

high impedance cable

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6
Q

common cause of noise

A

improper:
grounding
ground loops
shielding

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7
Q

ACTIVE crossovers are inserted __________ the power amplifier

A

before

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8
Q

compressor

A

compress signals from a high and low frequencies

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9
Q

what is the overall frequency band of the human voice

A

100hz to 6Khz

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10
Q

when you need to measure loudness use a

A

sound pressure level meter.

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11
Q

multiband equalizer

A

boost and cut signals. last step

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12
Q

how does humidity affect sound

A

dry air absorbs more acoustical energy

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13
Q

an active crossover is also known as a _______ level crossoer

A

low

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14
Q

real time analyzer

A

used to obtain an instantaneous display of the frequency response

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15
Q

what two things is a passive crossover sensitive to?

A

load impedance

source impedance

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16
Q

how does temp affect sound

A

sound passes through hot air faster

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17
Q

outdoor audio systems are affected by what 3 environmental factors

A

temp
wind
humidity

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18
Q

what audio component can directly drive a loudspeaker

A

power amp

19
Q

what is the best shielding you can use in a permanent install or within a rack or piece of equipment

A

foil because it has no penetrable points like a braid.

20
Q

when you want to record the physical wave form

A

osilloscope

21
Q

each time you double the number of microphones the system gain must be ____________ to avoid feedback

A

dropped 3 dB

22
Q

low pass filter

A

cuts out high frequencies

23
Q

when you need to know a signal source use

A

sine wave oscillator

24
Q

what is special about a lavalier microphone

A

small and cab be worn on clothing maintaining a consistent distance from voice

25
Q

three parts of a sound system

A

input transducer - signal processing - output transducer

26
Q

what is the common name for a pin connector and who invented it

A

phono pin

RCA radio corporation America

27
Q

when you need to test the polarity of a circuit use a

A

phase tester

28
Q

what is the speed of sound

A

1130 feet per second at sea level at 59 degrees

29
Q

oscilloscope

A

displays a visual representation of an electrical signal

30
Q

passive crossovers are inserted __________ the power amplifier

A

after

31
Q

phase testor

A

test polarity of a circuit

32
Q

noise gate

A

shuts off mic when not in use

33
Q

any piece of equipment used for sound reinforcement should cover what frequency range

A

20hz to 20khz

34
Q

high pass filter

A

cuts out low frequencies

35
Q

what is the function of a mixer

A

combine multiple inputs and create one output

36
Q

dynamic mics

A

is like a miniature loud speaker
most common
durable]
reasonable insensitive to environmental factors

37
Q

a passive cross over is also known as a ______ level crossover

A

high

38
Q

sine wave oscillator

A

signal generator that produces a sine wave

39
Q

when you have a pink noise generator as your test signal

A

real time analyzer

40
Q

best connections for avoiding ground loops and noise

A

tin and tighten

41
Q

limiters

A

limits either the high or the low frequencies not both

42
Q

what is the typical impedance of a balanced low impedance line input

A

600 ohlm

43
Q

define compression ratio as applied to audio systems

A

relationship between input and output transducers (2:1)

JATC 3rd Year - Midterm (8 decks)

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