How do speakers work? 

Years of questions answered

Still mind blowing how that works!

Always love explanations like this, with actual working models. Great video, thanks for your effort!

Wow I never knew speakers were THAT simple, blew my mind! Thanks for the video!

perfect example of how fractals and geometry are very useful in technology

Not once have I seen anything like this as a kid. That would have changed my life.

Awesome! As a young pre-scientist I love when I-m able to find videos where phenomena are explain. Thanks a lot, I'm using this in the next science fair, only with some personal upgrades ;) #ThanksForTheInspiration

Awesome...i love such simple and elegant experiments

Now I know exactly what I want to know. The best demostraction.

Very cool demonstration - would love to have gotten even more in-depth coverage of the pre-amp and post-amp signal and if there's anything neat going on there beyond simple amplification... I suppose there would be modulation effects of various sorts available for EQ/balance and whatnot =O

❤️❤️❤️ beautiful practical experiment

I still have questions lol how does a magnet and copper coil transfer all those sounds we hear through our speakers? I understand the concept but you would think it would just produce basic sounds, how does back and forth vibrations create music lol

Excellent explanation and working demo 10/10

That's the beauty of analog electronics.

Neat demo, only issue is in a speaker the permanent magnet is fixed and the coil (electromagnet) moves. Very similar.

All this science and the only thing I accidently achieved back in my day with a magnet was messing up one of my tv's by leaving some on top.

In more detail, a wire passing current that is sandwiched between the poles of two different attracting magnets will move at right angles to the magnetic field according to a "left hand rule" where you point your first finger from North to South direction, have your middle finger at right angles to your palm to denote conventional "current" from positive to negative, and your thumb in the "thumbs up" position. E.g. if north pole is on the right and south pole on the left, positive to negative in the wire is pointed away from you, then the wire will move "up" in the gap. A current in a wire will have a circular magnetic field around it (field lines in an infinite hula hoop around the wire with no "North" or "South" termination points). The direction is clockwise for conventional current moving away from you. The field is reinforced on the bottom by straight permanent magnet field lines from right to left, pushing the wire "up." The metal disc on top of the ring magnet is to conduct one pole's field lines to the outside of the coil gap. The metal "top hat" on the back of the magnet is to conduct the field lines from the other pole to the centre of the coil gap. Now you can turn a ring magnet into the optimum magnet for a speaker which is a horseshoe magnet with the ends bent in to face one another with a small gap, and lots of these magnets filed into wedge shape and glued together until a ring is formed. The coil is so you can have lots of parallel wires moving in the same direction and magnify the force. You can build a more primitive version with a simple neodymium cylinder inside the coil. Although the field lines won't be as concentrated in the direction you want (at right angles to the coil), the strength of the magnet will still be able to give a decent output. I did actually build a speaker but it had a vertical ring for a coil as I only had one pair of magnets to face each other. The other half of the coil wasn't in the gap so it did lose efficiency, but I would have needed another pair of magnets the opposite way round to not have it cancel out. I used a resistance meter so I could work out how much wire to use without overloading the amplifier.

This is so fun!

i love speakers but i love to learn about them even tho i already know every thing about them

This is wicked cool!

How did that song start to play? Could someone please explain?

wow, i really wanted to know what dave from sports was going to say smh

Super cool

Thanks I learned how to make my own speaker 🔈

What happeneds if it's a solid sheet of copper except for like the handle so in a safety precaution kind of standpoint you don't get shocked

Great❤😊

It's awesome

this video helped me make an informative speech thanks

That is amazing

Nice

so like, magnets = voltage?? and surface area of current = amps???

where did the sound came from in the end? from the piece of cardboard?

That's black magic

does it work with aluminium foil too

cool.

The guy in white laughs like Jimmy Kimmel

wow!

This confuses me as to how it replicates the sound. I mean the cap was not moving enough for the human eye to see it yet it was creating sound.... I understand scientificly it is a super simple speaker however average human brain makes it seem more complicated.

Wow

o o o, its magic. you knooowww

I’m still failing to understand how a piece of cardboard can sound like Pharrell

He must have forgot or ran out of time to use the plastic cone on the table to concentrate the sound I would have been cool to see too

whoah

Anybody know the background music?

isn't this a short circuit?

Hello, fashion lovers ❤

What song

hi

Woah so that's how speakers copy songs and boice Edit:I mean voice not boice

Okay - so now we all know that companies have been ripping us off for years....! I always wondered why Speakers are SO expensive!

but how do magnets work?

Over simplified

This is a clue on opening your 3rd eye!

Junk tools. Has a 15 or 18 inch subwoofer.

Does NO ONE show how an iPhone speaker works?

Listening from phones speaker