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2nd year > Apr 24 > Flashcards

Apr 24 Flashcards

1
Q

What is the difference between a condenser microphone and a dynamic microphone?

A

Condenser mic requires power source 9-48v

Dynamic is more durable.

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2
Q

What can cause “hum” noise in a sound system?

A

Induced A/C, power supply failure

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3
Q

What converts electrical energy into acoustic energy?

A

loud speaker - transducer

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4
Q

What converts acoustic energy into electrical energy?

A

microphone

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5
Q

With respect to cabling, magnetic fields are only canceled by two things. What are they?

A

Balanced cable

Distance from source

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6
Q

What is the typical impedance of a balanced, low-impedance line input?

A

600 Ω

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7
Q

What is the maximum current output of a 600W amplifier connected to a 16 Ω load?

A

6.12A 600/16Ω

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8
Q

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

A

foil shielding

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9
Q

When distributing sound, what is the main objective?

A

Create a uniform sound field.

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10
Q

What is the function of a mixer?

A

Combines multiple signals, provides input selection, and allows signal control.

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11
Q

What can be used to convert a conventional speaker into a speaker compatible with a constant voltage system?

A

Transformer 8 Ω output at secondary

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12
Q

There are two methods to distribute sound for a paging system. What are they and how do they work?

A

Constant amp systems: 70V and 25V

Self-amp systems: 24V

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13
Q

On it s secondary, a paging transformer will produce how many Ω?

A

8 Ω

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14
Q

In a self-amplified system, each speaker acts as its own ___ at ___ volts ___.

A

amp at 24 volts DC

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15
Q

A self-amplified system uses two pairs of conductors. What is each pair for?

A

1 pair for 24V power; 1 pair used for audio signal.

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16
Q

Why are constant voltage systems preferred for bigger installs?

A

One central amp can power a great number of speakers over a long distance; cheaper for scalability.

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17
Q

A balanced mic cable has three connections. What are they?

A

2 for balanced signal; 1 for ground (tip, ring, ground)

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18
Q

What type of mics can utilize phantom power from a mixer?

A

condenser

19
Q

P = I2 R - - so what happens to the power when current flow is increased by a factor or two?

A

Voltage is increased by a factor of 4

20
Q

With respect to self-amplified systems, the audio signal is the same as one you would find where?

A

analog telephone line

21
Q

What type of output is used with low impedance speakers?

A

direct output

22
Q

What is the proper amount of overhead to build into a paging system with regards to the amplifier’s capability

A

20%

23
Q

What would you use to electronically adjust the level of a page background music in applications where noise levels are continuously changing?

A

ambient noise sensor

24
Q

AUX inputs accept what kinds of signals?

A

Hi-Z, high impedance inputs, line level cables, about 6ft. cables

25
Q

What output is not affected by an amplifier’s master volume control?

A

Tape out

26
Q

If you are connecting speakers to a direct output, what is the most likely problem to occur?

A

impedance mismatch

27
Q

What is the purpose of a digital feedback terminal?

A

To eliminate feedback (acoustic)

28
Q

What is the purpose of a voice over IP gateway?

A

To make remote announcements sent over the internet, It converts analog telephony signals to digital

29
Q

For direct connected systems, what types of wire should be used and when?

A

16 over 100ft

18 under 100ft

30
Q

Transformer power loss is stated in what?

A

DB insertion loss

31
Q

Say you have two speakers. The cone on the first moves out and at the same time, the cone on the second moves in. What is this condition known as?

A

Out of phase

32
Q

When speakers are out of phase, what typically happens?

A

Lose up to 1/2 of their normal volume and will not sound nearly as well.

33
Q

Line matching transformers and associated speakers are connected in ___ across the amplifier’s output

A

parallel

34
Q

When installing a paging system, care should be taken to keep as much separation as possible between two things. What are they?

A

Mic and speaker

35
Q

Amplifiers with output circuits carrying audio signals can use Class 1, 2, or 3 wiring as long as they are what?

A

listed and marked

36
Q

Define the term temporary equipment as it relates to audio equipment

A

it’s taken down after the event

37
Q

Define rated outage power.

A

output voltage when delivering full power

38
Q

Ambient noise level is best found how?

A

SPL meter (tester)

39
Q

What is the most practical approach to wiring for multiple speakers?

A

zoning

40
Q

What must be done to a sound masking system so that all frequencies fall within the preferred masking curve?

A

calibrate for the environment

41
Q

Define white noise

A

unfiltered, unaltered thermal noise

42
Q

What are a transformer’s taps rated in?

A

Watts

43
Q

A sound masking system level should be how many dB louder than speech

A

1 - 5 dB

2nd year (3 decks)

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