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If you mean the external speakers they are for playing sounds, i.e. music, sound from video or alerts from the operating system. If you mean the internal speaker it is for alerting the user of more critical problems, i.e. a missing component (processor, graphics card), overheating or some sort of hardware failiure.
Yes
Depending on which sound system you want it can be expensive or it can be cheap. A good set of speakers will produce the same sound whether it is expensive or not.
Loud speakers can produce ultrasonic waves. But since the normal purpose of loud speakers is to produce sounds for people to hear, there is seldom a reason to produce sounds that people can't hear (other than to annoy certain animals).
An audiophile computer is a computer intended to produce the highest quality of sound from the device, including speakers and processing. The quality of the sound from the device is important so that it sounds clear and is true to the music.
The purpose is to either listen to audio on a computer without built in speakers or to boost sound
Sound is processed in the sound card of the computer. It then sends signals to the speakers. The speakers vibrate and make the actual sounds that you hear.
The Sony SRS-A201 Desktop Portable Computer Speakers have a full tange base.
No.
Internat speakers can play simple sounds, like the "beep" when you start the computer. See the related link for all the uses.
That sounds like it has to do with the electrical current running through it. You might have a problem with the internal wiring of the speakers.
It sounds, no pun intended, that the sounds are arriving at your speakers from somewhere. If you are connected to the Internet, then turn it off. If you have a wall that can you can move the computer to different to the wall or room you normally use, do that. There should be a reason why you are hearing sounds from the speakers. Good luck finding out what the reason is