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Avixa CTS-D > Audio Principles of Design > Flashcards

Audio Principles of Design Flashcards

1
Q

When creating a schematic diagram of audio signal flow, you should include:

A

Microphones
Mixers
Switchers
Routers
Processors

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2
Q

SPL should always fall between

A

0 and 140 dB SPL

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3
Q

What’s this formula used for?

A

Decibel change for power

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4
Q

You’ll need this formula to calculate _______________

A

Decibel changes in sound pressure level (SPL) over a distance

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5
Q

“Zero Reference” is also known as __________

A

“Reference Level”

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6
Q

0 dBu is equivalent to _____

A

0.775 Volts

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7
Q

0 dBv is equivalent to _____

A

1 Volt

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8
Q

Consumer audio level is often expressed as ____ dBv

A

-10 dBv

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9
Q

Line level should be between __ and __ dBu

A

0 and +4 dBu

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10
Q

Which SPL meter setting is mostly used to closely responds human hearing.

A

A-weighting

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11
Q

Which SPL Meter Class is designed to only support A-weighting, and intended for general use

  • Class 0
  • Class 1
  • Class 2
  • Class 3
A

Class 2

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12
Q

For speaker coverage, it takes into account which of the following?

A. Ceiling Height
B. Listeners ear-height
C. Speaker’s angle of coverage
D. Number of listeners

A

A. Ceiling Height
B. Listeners ear-height
C. Speaker’s angle of coverage

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13
Q

The formula to calculate the _______________ is as follows:

A

coverage area of a loudspeaker

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14
Q

What are the three loudspeaker coverage layouts?

A

Edge-to-Edge

Partial Overlap

Edge-to-Center

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15
Q

This formula is to calculate speakers wired in parallel with __________ impedances

A. Same

B. Different

C. Varying

D. Regulated

A

B. Different

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16
Q

To calculate the total impedance in a parallel circuit , with each speaker with the __________ impedance

A

Same impedance

17
Q

For program audio, what’s the recommended amplifier’s headroom?

A

20 dB

18
Q

Typical sound pressure level at listeners position for speech applications is ____ dB SPL

A

70 dB SPL

19
Q

Formula to calculate ____________

A

Electrical Power Requirements

20
Q

Loudspeaker ability to convert one form of energy into another

A

Sensitivity specification

21
Q

Amplifier’s voltage remains the same regardless the number of loudspeakers connected to it

  • True
  • False
A

True

22
Q

Microphone that picks up sound uniformly from all directions

A

Omnidirectional

23
Q

Mics usually worn by users

A. Lavalier
B. Handheld
C. Ceiling
D. Gooseneck

A

A. Lavalier

24
Q

PAG/NAG stands for ____________

A

“Potential Acoustic Gain” and “Needed Acoustic Gain”

25
Q

To work properly, a sound system must accomplish three things:

A
  1. Loud enough
  2. Intelligible
  3. Remain Stable
26
Q

For a typical speech reinforcement system, that level is around _______ to ______ dB SPL

A

60 to 65 dB SPL

27
Q

Speech signal-to-noise ratio is ____dB

A

25 dB

28
Q

If a sound reflection arrives at the listener 50 to 80 milliseconds later is considered:

A. An asset
B. Echo
C. Reflection
D. Refraction

A

B. Echo

29
Q

At which SPL levels listeners could complain about being too loud?

A

85 to 90 dB SPL

30
Q

Gain before feedback is referred to as

A

“Potential Acoustic Gain (PAG)”

31
Q

What is:
Equivalent Acoustic Distance (EAD) ?

A

Farthest distance from the source without need for amplification

32
Q

What’s the purpose of NAG calculation?

A

to determine how much Acoustic Gain is Needed to deliver the same level to listeners

33
Q

PAG calculation deals with equipment

True or False ?

A

True

34
Q

PAG deals with actual equipment and comprises _______ distance factors in its calculations

A

Four

35
Q

NOM stands for

A

Number of Open Mics

36
Q

the threshold of human hearing is 0dB SPL at _____ kHz ?

A

1 kHz

37
Q

PAG and NAG calculations to ensure audio system is

A. Loud enough
B. Intelligible
C. Stable
D. Optimal

A

C. Stable

Avixa CTS-D (17 decks)

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