How does a voltage going down a wire to a speaker make diffrent sounds ?

Question

i am confused as to how a voltage to a speaker can make the speaker emmit music of diffrent kinds ???

Answer 1

The voltage makes the electromagnet in the speaker move. The electromagnet is attached to a membrane, so it makes the membrane move too, thus creating sound waves. If you make the membrane move in a certain way, it will produce music.

Answer 2

Its tiny little variations in the voltage. To test this take a speaker and tap the terminals to a 9v battery. You will actually hear the sound of the current flowing.

Answer 3

Strictly speaking, its the CURRENT that generates the magnetic field that causes the cone to move.  The voltage is required to overcome the "resistance" (impedance) to the flow of current.

Its the CHANGE in current that causes a force to be applied to the cone.  A change in current causes a change in the magnetic field lines, which interacts with the magnetic field of the permanent magnet to create a reaction force that pushes apart or pulls together, depending on its polarity.  A constant voltage would give a constant current which would cause no movement of the cone.

Its kind of the same principle as an electric motor, or a servo.

Answer 4

The voltage causes an AC current to flow in the speaker coil.  The current generates a varying magnetic field that interacts with the magnetic field from the speaker magnet.  This alternating attraction/repulsion due to the magnetic fields interacting pushes and pulls the speaker cone out and in.  The moving speaker cone moves the air in front of the speaker, and Voila', sound is produced.

Answer 5

Traditionally (that is to say in analogue systems) - it is simply a reverse of how the sound was converted into electrical energy - usually via a microphone or pick-up when the mechanical sound energy was turned into electrical pulses - these are then relayed to the speakers which reconvert the energy to sound waves by oscillation of the cones in the speakers.

Answer 6

the voltage/charge has a frequency that depends on the source. When it hits the speaker, it makes it oscillate at that frequency, and, since each frequency produces a unique sound, the different frequencies each make different sounds

Answer 7

vibrations make sound , but if the speaker is damaged then sound distorts , the speaker is the weak link presumably so the speaker manufacture is paramount .

Answer 8

Well, voltage makes the speaker move, right?  Say, for instance, positive voltage makes the speaker go out, negative makes it go in.

Now, that's all well and good if you want maybe one click.  But sound is all about vibrations.  So, the trick is you have to send in an alternating current, making the speaker go in and out.  If you send in current that's alternating at, say, 440 times per second, you make the speaker go in and out at 440 Hz and get the famous "A" note that most western music tunes to.

That's for a pure tone, though, so the voltage just needs to change to match the changes in the oscillations of the sound.

But it's no different, really, than hitting a steel bar against something hard and listening to it ring.  You've caused it to vibrate with a certain frequency, which is all the voltage does for the speaker.

Answer 9

IInside the speaker is a coil of wire. The wire is attached to the frame of the speaker, and is considered to be stationary.

Inside the coil of wire is a magnet.  One end of the magnet is glued to the "cone" -- the paper or cloth part of the speaker.  The magent is free to move inside the coil of wire, and if the magnet moves so does the cone of the speaker.

When you apply voltage to a coil of wire, it generate a magnetic field. The magnetic field in the coil of wire will attract or repel the magnet.  When the magnet moves so does the cone.

Your stereo amplifier makes a voltage in the wire change according to the "analog" of the sound -- the louder the sound, the more voltage is produced.

This voltage goes down the wire and causes a magnetic field in the coil of wire in the speaker.  This causes the magnet to move.  The greater the voltage, the more the magnet moves, and when the magnet moves so does the speaker cone.

When the speaker cone moves, it causes the air around it to move.  Because of the voltage "analog" produced by the stero amplifier, the sound that comes out of the spekaer sounds just like the sound that went into the recording microphones in the music studio.