Output Devices - Speakers

Speakers
Speakers are attached to computers for the output of sound. Sound cards are required in the computer for speakers.

Classification of Speakers:

1. Internal – built in speakers.
- A very basic speaker found on the computer motherboard.

2. External – a separate set of speaker.
*important terms:*
>Satellite speakers are the speakers that carry the mid-bass on up in a three piece system that consist of a pair of "small" speakers (the satellites)
>Sub-woofer – Woofer is the term commonly used for a loudspeaker driver designed to produce low frequency sounds, typically from around 40 hertz up to about a kilohertz or higher.

Different Types of Computer Speakers


PC Speakers
The most conventional speakers found in the primitive IBM machines.

Multi-channel Speakers
The new age speakers where the channels represent the output devices. This new generation speakers are exceptional on sound quality but are on the higher side of the budget. 
5.1 Speaker
7.1 Speaker

Standard Speakers
The standard speakers are nothing but the normal 2.1 channel or 2 channel speakers. These are the most popular type of speakers with generating enough sound required by a home or corporate user. The standard speakers are cheap and easily installable with limited wiring compared .
USB speakers
There are also USB speakers which are powered from the 5 volts at a few milliamsp provided by the USB port, per the standard. The USB powered amplifier draws the power through a USB cable/plug. No batteries or AC power source are required.

Wireless
More recently, wireless speakers have allowed users to avoid the mess of wires associated with surround sound speaker setups. While these are excellent for many users, they can often conflict with a home Wi-Fi network.

There are three main computer stereo cables.
1.    RCA Cable Plug – Right (White or Black) Left (Red)
2.    1/8 inch – 3.5mm mini stereo plug.
3.    Single plug and play USB cables – hot swapping

*note: it all depends on the brand and the model of speaker*
Specifications
  
    
Sound pressure level (SPL) that the speaker can deliver. 
  
    
Typical design power used for driving the speaker.
 
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Input impedance for a speaker is optimally matched to the output impedance of the driving amplifier for most efficient and truest sound replication.
 
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The frequency response, or dynamic range, is the range of frequencies over which the speaker will operate while still meeting its performance specifications.
 
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Nominal size of speaker; diameter or width for round or square speakers, shorter dimension for rectangular or oval speakers.
 
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Weight of speaker, including any enclosure or attached features.
 
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Features

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Your choices are...
 
    

 
  
    
  
    
  
    
  
    
  
    
  
    
  
  
  
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Application

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Your choices are...
 
    

 
  
    
Active noise cancellation 
  
    
Designed for use in aircraft.
 
  
    
Speakers for radio or audio systems in cars, trucks, and other vehicles.
 
  
    
Professional grade audio speaker components and/or systems for use in recording studios or television and radio broadcast facilities and equipment.
 
  
    
Designed for use with computers or industrial workstations.
 
  
    
Any consumer electronics application, including video games, television speakers, consumer-grade radios, toys, etc.
 
  
    
Designed for installation in headsets, helmets, earphones, etc.
 
  
    
Designed and constructed for use in public address systems or installation in public facilities.
 
  
    
Suitable for use in the reproduction of high fidelity audio and music sound.
 
  
    
Designed for use in applications such as intercom systems, security access stations, and/or intraoffice paging or communications.
 
  
    
Designed for use with telephones and other voice communication products.
 
  
    
Other unlisted, specialized, or proprietary application.
 




Inputs received by the speakers:
1. Analog
2. Digital - most common

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