Do you recall how many times you hear recorded music being played on the radios on TV or the streets every single day? Truth be told, without sound speakers like Pioneer AVH-W4500NEX review, you’ll never be able to hear such music at all.
In fact, most of the music we hear being played back on various devices every single day comes with speakers attached inside of them. TVs, radios, smartphones, computers – they’re just a few of the many gadgets that produce sound with the help of speakers. But how exactly do they work?
How Sound is Created
To answer the question, let’s first have a basic understanding as to how sound is created. The eardrum, which is a thin piece of skin located in your ear, is the one responsible for your hearing. Basically, it will vibrate once it picks up sound. After that, it then sends a signal to your brain where said vibrations are interpreted as sound. These vibrations are due to the changes in air pressure, but there are also other causes for such.
When an object vibrates in the air, it then produces sound. As it vibrates, it moves the air particles that are around it. In turn, those particles will move the air particles around them.
In the same manner, a vibrating object will then send a wave of pressure fluctuation, and as soon as it reaches your ear, it will then vibrate your eardrum. This is how sound is created.
How Speakers Work
Now that we have an idea of how sound is created, let’s now find out how sound speakers work.
Compared to a microphone, a speaker takes an electrical signal then translate it into physical vibrations. This results in sound waves. A speaker is essentially the last translation machine, and as long as it’s working properly, it will produce the same vibrations that a microphone has originally encoded on a CD, tape, etc.
A speaker has a so-called speaker driver which is responsible for rapidly vibrating a cone or diaphragm. The diaphragm is often made of plastic or paper and is attached to the suspension’s wide end.
Meanwhile, the suspension is a flexible material that allows the diaphragm to move. It’s then attached to the basket which is the metal frame of a speaker driver. The end of the diaphragm is connected to the voice coil which is then attached to the basket via a ring of flexible material known as the spider.
The spider will hold the coil in place while still allowing it to move back and forth. As the electrical current that flows through the coil changes its direction, it will cause the coil’s polar orientation to reverse.
The voice coil is essentially a basic electromagnet. Compared to a permanent magnet, you have the option to alter an electromagnet’s pole orientation. By reversing current flow, you can cause the north and south ends of the electromagnet to switch orientation – and this is what a stereo signal does.
As electricity starts flowing back and forth, the electromagnet will either repel or attract the permanent magnet, causing the coil to move back and worth. As a result, the moving cone will pump sounds, and that the sound we tend to hear.