Audio Principles of Design Flashcards
When creating a schematic diagram of audio signal flow, you should include:
Microphones
Mixers
Switchers
Routers
Processors
SPL should always fall between
0 and 140 dB SPL
What’s this formula used for?
Decibel change for power
You’ll need this formula to calculate _______________
Decibel changes in sound pressure level (SPL) over a distance
“Zero Reference” is also known as __________
“Reference Level”
0 dBu is equivalent to _____
0.775 Volts
0 dBv is equivalent to _____
1 Volt
Consumer audio level is often expressed as ____ dBv
-10 dBv
Line level should be between __ and __ dBu
0 and +4 dBu
Which SPL meter setting is mostly used to closely responds human hearing.
A-weighting
Which SPL Meter Class is designed to only support A-weighting, and intended for general use
- Class 0
- Class 1
- Class 2
- Class 3
Class 2
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. Ceiling Height
B. Listeners ear-height
C. Speaker’s angle of coverage
The formula to calculate the _______________ is as follows:
coverage area of a loudspeaker
What are the three loudspeaker coverage layouts?
Edge-to-Edge
Partial Overlap
Edge-to-Center
This formula is to calculate speakers wired in parallel with __________ impedances
A. Same
B. Different
C. Varying
D. Regulated
B. Different
To calculate the total impedance in a parallel circuit , with each speaker with the __________ impedance
Same impedance
For program audio, what’s the recommended amplifier’s headroom?
20 dB
Typical sound pressure level at listeners position for speech applications is ____ dB SPL
70 dB SPL
Formula to calculate ____________
Electrical Power Requirements
Loudspeaker ability to convert one form of energy into another
Sensitivity specification
Amplifier’s voltage remains the same regardless the number of loudspeakers connected to it
- True
- False
True
Microphone that picks up sound uniformly from all directions
Omnidirectional
Mics usually worn by users
A. Lavalier
B. Handheld
C. Ceiling
D. Gooseneck
A. Lavalier
PAG/NAG stands for ____________
“Potential Acoustic Gain” and “Needed Acoustic Gain”
To work properly, a sound system must accomplish three things:
- Loud enough
- Intelligible
- Remain Stable
For a typical speech reinforcement system, that level is around _______ to ______ dB SPL
60 to 65 dB SPL
Speech signal-to-noise ratio is ____dB
25 dB
If a sound reflection arrives at the listener 50 to 80 milliseconds later is considered:
A. An asset
B. Echo
C. Reflection
D. Refraction
B. Echo
At which SPL levels listeners could complain about being too loud?
85 to 90 dB SPL
Gain before feedback is referred to as
“Potential Acoustic Gain (PAG)”
What is:
Equivalent Acoustic Distance (EAD) ?
Farthest distance from the source without need for amplification
What’s the purpose of NAG calculation?
to determine how much Acoustic Gain is Needed to deliver the same level to listeners
PAG calculation deals with equipment
True or False ?
True
PAG deals with actual equipment and comprises _______ distance factors in its calculations
Four
NOM stands for
Number of Open Mics
the threshold of human hearing is 0dB SPL at _____ kHz ?
1 kHz
PAG and NAG calculations to ensure audio system is
A. Loud enough
B. Intelligible
C. Stable
D. Optimal
C. Stable
