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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: What is the interaction of the loudspeaker and amplifier? posted by George S. Roland on August 18, 2020 at 07:27:05:
A lot of amplifiers have a differential output stage, in which case neither binding post is at a constant voltage i.e. ground. With a differential output stage, the voltage at the black post is just the negative of the voltage at the red post.It doesn't matter anyway because the speaker responds to the voltage difference between the two binding posts. All of the following examples produce the exact same motive force from the speaker:
Red = +1V, Black = 0V
Red = 0V, Black = -1V
Red = +0.5V, Black = -0.5V
Red = 1001V, Black = 1000VThe hose analogy is intuitive, but you should also know that the electrons barely move at all, they just jiggle back and forth by maybe a micrometer. And electrons aren't the only charge carrier, there are also "holes".
To continue with the hose analogy though, think of the whole thing as one big closed loop that goes through the amplifier's output stage, the cables, and the driver's voice coil (let's leave out the crossover for now). When there is no signal, the pressure of the water everywhere in the loop is constant. It could be at zero pressure (i.e. zero voltage), but it doesn't have to be. Now imagine there is a moveable baffle in the hose. That's the output stage. On the plus side of the sine wave, the baffle is moving in one direction, applying pressure which moves the water in the hose through the driver's voice coil. The voice coil is in a magnetic field and because of that, the current flow produces a mechanical force that moves the driver forward against the resistance of the air and the suspension. It takes work to push current through the voice coil, and that electrical work is converted to mechanical work. On the minus side of the sine wave, imagine that baffle (the output stage) moving in the other direction, reversing the flow of water in the hose, which in turn reverses the direction of mechanical force produced by the voice coil.
Edits: 08/20/20
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- RE: What is the interaction of the loudspeaker and amplifier? - Dave_K 11:54:34 08/20/20 (0)
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