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Sound Reinforcement For Stage > Final Exam > Flashcards

Final Exam Flashcards

1
Q

An energized speaker cone moving outwards is said to be what?

A

Making a compression wave

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2
Q

An energized speaker cone moving inwards is said to be what?

A

Generating an expansion wave

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3
Q

A speaker cone that has moved out, moved in and returned back to its starting point is said to have what?

A

Completed one cycle

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4
Q

The rate at which any kind of motion repeats itself is known as its what?

A

Frequency

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5
Q

When a motion repeats itself its measured in what?

A

Cycles per second

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6
Q

A sound with low frequency is heard as a what?

A

Sound with low pitch

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7
Q

3500 cycles per second

A

3.5kHz

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8
Q

What is the frequency response of the normal human ear?

A

20Hz - 20kHz

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9
Q

What is the speed of sound traveling through air?

A

1130 ft/s

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10
Q

Human hearing has a normal range of what?

A

Ten octaves

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11
Q

What frequency range represents an octave?

A

250Hz - 500Hz

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12
Q

What decibel level has OSHA established as enough to cause lasting hearing damage?

A

125dB

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13
Q

What is responsible for our ability to hear in stereo?

A

Audio processing that works in millionths of a second

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14
Q

Fletcher-Munson established the human ear to be the most sensitive at what frequency?

A

3.15kHz

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15
Q

Fletcher-Munson established that as the volume decreases the ear’s response to very low frequency does what?

A

Decreases

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16
Q

What type of frequencies can bend around corners and travel through dense materials?

A

Low frequencies

17
Q

On a graphic equalizer, a FIXED factory set filter could be found where?

A

Individual frequency faders

18
Q

On a graphic equalizer, a VARIABLE user-set filter could be found where?

A

Range switch

19
Q

On a graphic equalizer, a SHELF response curve would be found where?

A

Lo-Cut control

20
Q

On a graphic equalizer, a PEAK response curve would be found where?

A

Individual frequency faders

21
Q

What two purposes do graphic equalizers serve in a live sound system?

A

Tune speakers

Avoid feedback

22
Q

A 1/3 octave graphic equalizer would have how many frequency faders?

A

31

23
Q

A two-channel graphic equalizer that sets the frequencies of both channels with a single slider is called what?

A

Stereo

24
Q

The Clip Indicatior Light on a dbx graphic EQ indicates what?

A

Excessive input level

25
Q

The 4-LED Bar Meter on a dbx graphic EQ indicates what?

A

Output signal level

26
Q

What approach to equalization is considered Best Practice?

A

Start by reducing the frequencies you feel are too loud

27
Q

What two purposes do peak limiters play in a live sound system?

A

Avoid distortion and damage to amps, speakers, and ears.

Reduces output above certain level.

28
Q

What function of a peak limiter is needed to effectively handle a combined mix of vocals and instruments?

A

Auto attack/release

29
Q

What function of a peak limiter is needed in order to limit only certain frequencies?

A

Side chain with a graphic EQ

30
Q

What control determines when gain reduction is to begin?

A

Threshold

31
Q

What control determines how much the gain will be reduced?

A

Ratio

32
Q

What control sets the amount of signal sent to the amps?

A

Output

33
Q

What type of compression is the most appropriate for system limiting?

A

Hardknee

34
Q

What compression ratio is the most appropriate for system limiting?

A

20:1

35
Q

Every crossover point has to contain what?

A

High-pass filter

Low-pass filter

36
Q

Sound cutting in and out while music plays at low volume could be the result of what?

A

A noise gate with the threshold set too high

37
Q

What is a driver?

A

Vibrating element that changes electrical energy into acoustical

Sound Reinforcement For Stage (1 decks)

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