Sound Reinforcement Final UPDATED Actual Exam Questions and CORRECT Answers
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Sound Reinforcement
Instelling
Sound Reinforcement
Sound Reinforcement Final UPDATED
Actual Exam Questions and CORRECT
Answers
What is sound reinforcement? - CORRECT ANSWER- Process of manipulating &
amplifying sound over an area that the source, by itself, would not be capable of covering
adequately.
Primary requirements of a sound reinf...
Sound Reinforcement Final UPDATED
Actual Exam Questions and CORRECT
Answers
What is sound reinforcement? - CORRECT ANSWER✔✔- Process of manipulating &
amplifying sound over an area that the source, by itself, would not be capable of covering
adequately.
Primary requirements of a sound reinforcement system - CORRECT ANSWER✔✔-
Intelligibility, Fidelity, Power, and Monitoring and Controllability
Secondary requirements of a sound reinforcement system - CORRECT ANSWER✔✔-
Portability, longevity, and flexibility
Basic sound system model - CORRECT ANSWER✔✔- Input transducers - signal processors
- output transducers
What is natural sound? - CORRECT ANSWER✔✔- Unprocessed sound
What is a Transducer? - CORRECT ANSWER✔✔- Device that captures the sound and gets it
into a form that the system can process.
What is a Transformer? - CORRECT ANSWER✔✔- A ___ is a static electrical device that
transfers electrical energy between two or more circuits.
Fixed Installation - CORRECT ANSWER✔✔- For venues with regular sound needs
Portable P.A. - CORRECT ANSWER✔✔- Can be taken from one location to another
Personal P.A. - CORRECT ANSWER✔✔- Smallest; can usually fit into a car
Range of 10-20 ft.
,Band P.A. - CORRECT ANSWER✔✔- Designed to reinforce small to large venues
Easily scalable
Best for groups of 10-2,000 people
Tour/Stadium P.A. - CORRECT ANSWER✔✔- Extreme end of PA systems
Requires small army of people & trucks
Use same components - just more & bigger versions
Needs more set up time & knowledge
What are three common types of distortions? - CORRECT ANSWER✔✔- 1. Overdriven
sound
2. Harmonic Distortions
3. Intermodulation
What constitutes "the sound environment"? - CORRECT ANSWER✔✔- The collection of
objects, conditions, and circumstances in which the sound system operates and with which it
interacts.
What are the three major conditions that the environment can affect? - CORRECT
ANSWER✔✔- 1. Affects how we, as engineers, hear
2. Affects the perceived performance of the system
3. Affects how the audience hears
Sound waves are by nature ___ waves. - CORRECT ANSWER✔✔- longitudinal
We use 2D graphical representation of sound waves known as ___ waves. - CORRECT
ANSWER✔✔- Transverse
What is Reflection? - CORRECT ANSWER✔✔- Interactions with solid surfaces and objects
in the environment
,What is Diffusion? - CORRECT ANSWER✔✔- Reflections from a rough or irregular
surface. Reflective energy is propagated in many directions.
What is Reverberation? - CORRECT ANSWER✔✔- Sounds reflected from various surfaces
Early Reflections - CORRECT ANSWER✔✔- <80ms
Persistent Reflections - CORRECT ANSWER✔✔- ≥100ms
RT60 - CORRECT ANSWER✔✔- The amount of time it takes the reverberation of a room to
decay 60dB below the initial SPL of the direct sound.
What is Absorption? - CORRECT ANSWER✔✔- ___ occurs because the energy carried by
the wave, which was previously used to displace air molecules, is now being used to displace
the molecules of that object. It takes more energy to displace the molecules of the object than
of air.
What is the Absorption Coefficient? - CORRECT ANSWER✔✔- Ranges from 0-1, with a
"1" being 100% absorptive.
A material has an absorption coefficient of 0.15 at 500Hz. What does that mean? -
CORRECT ANSWER✔✔- The material absorbs 15% of the sound at 500Hz.
What is Diffraction? - CORRECT ANSWER✔✔- The change in direction of travel of a wave
due to interaction with an object.
What does it mean to "toe in" a set of speakers, and why is this considered "best practice" in
sound reinforcement? - CORRECT ANSWER✔✔- It is how the speakers are angled towards
the main listening position. If the speakers are angled inward >< then that means they are "toe
in". That way the sound is directed towards the listener.
What is inside a Microphone? - CORRECT ANSWER✔✔- Transducer
, What is inside a DI Box? - CORRECT ANSWER✔✔- Transformer
What are the two main types of transducers in a sound reinforcement system? - CORRECT
ANSWER✔✔- Dynamic and Condenser
What does a balanced connection mean? - CORRECT ANSWER✔✔- A ___ has three
conductors in the connector and three wires in the cable: two signals wires plus a separate
ground wire.
___ use two signal wires; both carry a copy of the signal, but the two copies are sent with
their polarity reversed. If you sum two signals that are identical but are reversed in polarity,
the signals cancel out, leaving you with silence.
What is a unbalanced connection? - CORRECT ANSWER✔✔- An ___ consists of two
connectors with two conductors each, connected by two wires inside the cable—a signal wire
and a ground wire.
Typical line level signal in professional audio is ___ dBu. - CORRECT ANSWER✔✔- +4
Typical microphone level signal is between ___ dBV and ___ dBV. - CORRECT
ANSWER✔✔- -60 and -40
What is the pinout for an unbalanced 1/4" connector? - CORRECT ANSWER✔✔- Tip-Ring
What is the pinout for a balanced 1/4" connector? - CORRECT ANSWER✔✔- Tip: Left
positive
Ring: Right positive
Sleeve: Cable shield
What is the pinout for an XLR connector? - CORRECT ANSWER✔✔- Pin 1: Ground
Pin 2: Positive
Pin 3: Negative
What is the pinout for an RCA jack? - CORRECT ANSWER✔✔- Ring: (Right Channel)
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