How does speaker make sound?

Answer 1

Vibrations don't create sound waves. Rather, sound waves are vibrations: specifically, they are air molecules vibrating against your eardrum in response to changes in air pressure, caused (and provided) by the energy radiating outward from the source of the sound.

Answer 2

Let's look quickly at the two main components of the driving signal. One is amplitude and the other is frequency. After we check them out, we'll combine what we know and make the whole thing work. 'K? Amplitude first. The greater the amplitude of the driving signal, the more it (the driving signal) will drive the speaker cone or diapharagm out and back in on each cycle. That will make a louder sound. The less the amplitude, the less distance the cone is driven out and in on each half of the cycle. Softer sound. A speaker converts electrical energy into mechanical energy. And we've just cracked part of the puzzle. On to frequency. The greater the frequency of the driving signal, the higher the pitch of the sound. A signal that drives the cone in and out very rapidly is making a higher frequency sound. With a low frequency, the cone moves in and out more slowly and the pitch of the sound is low. We good? Cool. When the electrical signal drives the voice coil (or piezoelectric crystal for speakers that flavor), it causes the cone (diaphragm) to move in and out "in time" to the driving signal, as we've just gone over that in the above blocks. When the cone moves out, it compresses a wall of air in front of it. Pretend for a moment that the cone stops after coming all the way out to the peak of that portion of the driving signal. The compressed air, all those little atoms and molecules, are all jammed up together. They don't like that. They push out on their neighbors. And their neighbors push out on their neighbors. The compression wave is moving away from the surface of the cone. And it keeps going. The amplitude of the signal will determine how much compression occurs, and that will determine how much "smoosh" the air gets. And so on and so on in front of the cone. The compression wave travels out from the source like the wave from a rock tossed into a calm pond. Simple. On the back half of the cycle of the signal, the cone is pulled back into the frame of the speaker. This creates something like a mini vacuum in front of the cone. It's called rarefaction. And this rarefaction wave causes air atoms and molecules to rush in to fill up the space the cone just left. And their neighbor atoms and molecules behind them rush in to take up that space. And so on. The rarefaction wave travels out from the cone of the speaker just like the compression wave did. Like the wave on that pond. Easy. Compression and rarefaction waves travel away from the speaker cone, and that moving air is mechanical energy that we call sound. The amount of compression and rarefaction (c & r), and the rate of that c & r determine the "volume" or loudness of the sound and the pitch of the sound respectively. You down now, dawg? Now we know the answer to the question about whether a tree falling in a forest makes sound if no one is there to hear it. Piece of cake. As an aside, it takes more energy to create a low note of the same apparent sound level as a high note. That's why bass speakers are large and require more power to drive them. This is aside from the fact that some cats like to "bump" their tunes and get the phat bass beats to carry 'cross town.

Answer 3

Vibrations create sounds by stimulating nerves in the ear structure. Normally this is done by vibrating the eardrum, but it can also occur by vibrations being conducted through the bones of the skull and ear structure.

In general, vibrations have to be between 20 Hertz (20 vibrations per second) and 20,000 Hertz in order to produce the sensation of sound. Many people cannot hear vibrations in the extreme lower and (especially) the extreme upper part of this range because of damage to their inner ears.

Answer 4

The electomagnet changes electical enengy to mechanical energy that vibrates the speaker to produce sound.

Answer 5

The vibrations of the speaker cause vibrations to the air; these vibrations are transmitted as sound waves (the sound waves ARE the vibrations of the air).

Answer 6

They make the air vibrate.