Sound Systems Components and Specifications

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Questions and Answers

What is the main purpose of a sound reinforcement system?

To amplify and reinforce the sound (correct)

To reduce the loudness of the sound

To completely mute the sound

To distort the sound quality

In an ideal sound system, what should be the characteristic of frequency response?

Muted frequency response

Linear frequency response (correct)

Non-linear frequency response

Distorted frequency response

What does directivity refer to in a sound system?

The ability to distort sound waves

The ability to play sounds in reverse

The characteristic of where sound appears to be coming from (correct)

The ability to completely silence sound

At what distance should an ideal sound system provide the same loudness and quality of sound for speech?

At a distance of 2-3 ft Signup and view all the answers

Where would a sound system typically be required based on size?

Spaces larger than 50,000 cu.ft. Signup and view all the answers

'Directionally invisible' loudspeakers mean that:

The listener perceives the sound as coming from the origin Signup and view all the answers

What population size would necessitate a sound system according to the text?

Around 550 persons Signup and view all the answers

'Linear frequency response' in an ideal sound system implies:

'Same relation' between frequency components as the original sound Signup and view all the answers

What is the purpose of adding 10 dB to noise insulation requirements?

To reduce the overall noise level Signup and view all the answers

How does the installation of acoustical materials affect noise in a room?

Reduces the reverberation time Signup and view all the answers

In what type of spaces are absorption techniques particularly effective?

Spaces with hard surfaces and little absorptive content Signup and view all the answers

What is one of the benefits of using absorption techniques in rooms with distributed noise sources?

Enhanced localization of noise Signup and view all the answers

Why is it important to have absorption techniques in spaces with hard surfaces and little absorptive content?

To decrease the reverberation time Signup and view all the answers

What is the main purpose of absorption recommendations in relation to room characteristics?

To reduce the overall noise level Signup and view all the answers

Which of the following is NOT true about acoustical materials' effects when installed in a room?

Increases overall noise level Signup and view all the answers

What is a key method mentioned for reducing machinery noise at its source?

Sound-absorptive treatment Signup and view all the answers

What are the principal sources of room noise mentioned in the text?

Machinery, people, and outdoor sources Signup and view all the answers

Which of the following is NOT mentioned as a principal contributor to noise in offices, churches, and residences?

Birds chirping Signup and view all the answers

What is the term used to describe the highest level of noise within a building that neither disturbs its occupants nor impairs its acoustics?

Acceptable noise level Signup and view all the answers

What is emphasized as an important factor in selecting the site of a building to control noise?

Choosing a quiet site away from noisy activities Signup and view all the answers

In what way can architects contribute to planning against noise in buildings?

By cooperating with civic authorities to segregate noisy industries Signup and view all the answers

What is mentioned as an indispensable part of good planning against noise in buildings?

The layout of the building and grading of the site Signup and view all the answers

'Quiet sites' are dependent on which key factor?

'Zoning ordinances' and their enforcement Signup and view all the answers

What are the three basic elements that all sound systems consist of?

Input devices, amplifier(s), loudspeaker systems Signup and view all the answers

What is a control frequently required in theatre systems?

Delay mechanism Signup and view all the answers

What is the intended purpose of an amplifier in a sound system?

To produce different intensity levels of sound Signup and view all the answers

In noise control, what knowledge should an intelligent approach be based upon?

Understanding nature and distribution of noise Signup and view all the answers

Which component is responsible for converting sound signals into electrical signals in a sound system?

Input device Signup and view all the answers

What is the recommended intensity level for symphonic music in a sound system?

105 db Signup and view all the answers

Which factor is important for noise reduction according to the text?

Utilizing varied types of partitions and flexible connectors Signup and view all the answers

What is the purpose of a delay mechanism in a sound system?

To add a time delay to signals sent to loudspeakers Signup and view all the answers

What is a common source of solid-borne noise?

Machinery vibrations Signup and view all the answers

How does the speed of solid-borne sound transmission compare to the speed of sound in air?

About ten times faster Signup and view all the answers

Which material is NOT mentioned as a means to reduce impact transmission to the floor?

PVC pipes Signup and view all the answers

What is the purpose of using a segment of flexible metallic or rubber hose in a pipe?

To lessen the propagation of impulses along the pipe Signup and view all the answers

In what context are the ratings of floor constructions compared with the concrete slab itself?

For solid-borne sound reduction Signup and view all the answers

What is a key difference between solid-borne noise and airborne sound in terms of transmission and suppression?

The origin of the noise Signup and view all the answers

Which type of noise usually originates from machinery vibration?

Solid-borne noise Signup and view all the answers

What impact does solid-borne noise have on a concrete slab's rating?

Decreases the rating Signup and view all the answers

Study Notes

Sound Reinforcement Systems

The purpose of a sound reinforcement system is to reinforce sound that would otherwise be inadequate, providing the same loudness and quality as the original sound.
An ideal sound system should have a linear frequency response, directionality, and make the sound appear to come from the originating source.
Sound systems are typically required in spaces larger than 50,000 cu.ft or with a population of 550 people.
A sound system consists of three basic elements: input devices, amplifier(s), and loudspeaker systems.
Input devices include microphones, recorded materials, and commercial music sources.
Amplifiers and controls are used to produce intensity levels of 80 db for speech, 95 db for light music, and 105 db for symphonic music.
Delay mechanisms or circuits can introduce a time delay into a signal being fed to a loudspeaker.

Noise Control

An intelligent approach to noise control requires knowledge of the magnitude, nature, and distribution of noise in buildings and outdoors.
Acceptable noise levels in buildings vary depending on the type of building and its purpose.
Noise control measures include:
- Siting and planning against noise
- Grading and landscaping
- Building layout
- Reduction of sound through partitions and flexible connectors
- Reduction of machinery noise at its source
- Reduction of noise by sound-absorptive treatment
The principal sources of room noise can be grouped into three broad classifications: people, machinery, and outdoor sources.
Outdoor noise is often the principal contributor to noise in offices, churches, and residences, with automobile traffic being the largest source.

Air-Borne Noise Reduction

Noise insulation requirements vary depending on the type of building and its purpose.
Noise reduction can be achieved through sound-absorptive treatment, which:
- Reduces reverberation time
- Reduces the overall noise level
- Localizes noise to the region of its origin
Absorption techniques are useful and effective in certain situations, such as:
- Changing room reverberation characteristics
- Reducing noise in spaces with distributed noise sources
- Reducing noise in spaces with hard surfaces and little absorptive content

Solid-Borne Sound Reduction

Solid-borne noise usually originates from impacts or machinery vibration and travels through a solid building structure with a speed of about ten times that of sound in air.
Measures for reducing solid-borne noise include:
- Using heavy carpeting, cork tile, or linoleum on felt to reduce impact transmission to the floor
- Using a segment of flexible metallic or rubber hose in a pipe to lessen the propagation of impulses along
Floor and ceiling constructions can be rated for their effectiveness in reducing solid-borne noise.

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Description

Learn about the essential elements and requirements of sound systems, including input devices like microphones and audio sources, amplifiers for controlling intensity levels, and loudspeaker systems. Explore the specifications needed for different types of audio content.