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In Reply to: RE: How to Determine Speaker Direction when no Indicators? posted by HiOnFi on July 28, 2024 at 13:05:36
Speaker cables carry AC so making them directional makes no sense.The drivers need to move BOTH ways.
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2022/03/30 Historical Records CENSORED
Edits: 08/04/24Follow Ups:
But they don't move both ways at the same time. Therefore, both + and - wires should be controlled for directionality for best results. Confucius say always put best foot forward.
Edits: 08/06/24
That made no sense.
What happens when drivers are reversed (backwards firing) or push pull ?
Same situation, AC, not DC.
Both + and - have to carry the alternating current.
Again, they are not diodes or Tesla valves.
.
2022/03/30 Historical Records CENSORED
One wire is connected to one side of the voice coil, the other wire is connected to the other end. When the signal comes in on the + side the diaphragm moves out. At that instant, the signal traveling on the other wire (-) away from the voice coil does nothing. That direction is the "bad" direction. It's the interaction of the magnetic field part of the signal with the big magnet structure that moves the diaphragm.current doesn't travel in a conductor, it's a scalar quantity, it's a calculated quantity.
Edits: 08/06/24 08/06/24 08/06/24
In an electromagnetic driver, such as the one you're describing, the audio signal is per se AC. Because it is alternating current, it is in effect moving back and forth (if you will) in the stationary magnetic field of the permanent magnet structure, which is held fast by the basket. Thus the electromagnetic force developed by the audio signal in the coil drives motion of the diaphragm, because the coil is attached to the diaphragm. The polarity of that current is changing according to the signal driving it; that pushes and pulls the diaphragm, in one direction or the other. Excursions of the diaphragm in both directions (in and out) are responses to forces in both directions.
A magnetic field is created when current (moving electrons) travels though a coil. That magnetic field is what interacts with the large magnet of the speaker and makes the diaphragm move. Electromotive force is what pushes the electrons, not the diaphragm. In reality electromotive force is not a force, units are volts. Does that surprise you?Current is a calculated quantity, it's a scalar, so has no direction. The only thing that's moving is the electrons, one millionth of an inch at a time.
Edits: 08/08/24 08/08/24
"a current of one ampere is one coulomb of charge going past a given point per second"
How is that not direction?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
So many wrongs it's silly to go further. To anyone else, there are many educational videos on the work of Maxwell and Faraday that are worth consulting. My main point was to refute the notion that the "electron" on its way back to the amplifier is per se a misconception.
Best not to even start with that one.
Sometimes its just best to ignore.
J.
Whatever. Thanks for trying.
I have magnets on both sides of the diaphragms and ribbons.
I also have push pull bass which one driver moves "forward" while the other moves "backwards" in a force cancellation configuration and linear fore/aft motion averaging.
Both +/- push and both +/- pull AT THE SAME TIME.
Both need the same electrical signals rendering the notion of "directional" wires nonsense.
.
2022/03/30 Historical Records CENSORED
The diaphragm moves in and out at the rate of instantaneous audio signal, each wire procides 1/2 of the complete audio signal. When electrons move toward the voice coil the electrons on the other wire move in the opposite direction. When electrons move away from the voice coil you can ignore, it. We only care about electrons moving toward the voice coil, they're the ones that make the diaphragm move. Follow?
NOPE:+ MAGNET PUSH --> VOICE_COIL--> PULL MAGNET
- MAGNET PULL <--VOICE_COIL <-- PUSH MAGNET
If what you are saying is true:
Placing a DC battery on a speaker with correct polarity it will move forwards.
If you put the same DC battery on in reverse polarity, the driver won't move backwards. That is NOT true.
No voltage moves the driver to the center location.
.
2022/03/30 Historical Records CENSORED
Edits: 08/06/24 08/06/24
Of course the battery moves the diaphragm. It moves out and stays out. That's why two wires AC are needed for audio. The IN and OUT signals come in on different wires, + and - . The signal alternates on both + and - wires. It alternates at the instantaneous audio frequency. Electrons move only very slightly at one time in an AC circuit, about one millionth of an inch at a time.
Edits: 08/07/24
LMAO
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Nt
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