Check this out. No need to spend all that money, make your own speakers with some simple ingredients you can find at home! 
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The first one was so dumb… lol. I guess in theory, the penny is supposed to act as a voice coil? But it’s also missing a magnet… and it would probably need a lot more power than a CD Walkman can output…
Second one was legit kinda cool though.
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Related (and may actually be worth trying):
This one has a lot of basics when it comes to speaker design:
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Wow, this is fascinating and tempting.
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Yeah i really want to make a speaker now lol. its hard to tell through the video how they sound. but its fascinating how easy and simple it looks lol.
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That dude was the beginning of the end for Mythbusters. If it wasn’t for Kari and Grant that second cast would have drowned the show.
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Wait, is this you?
One day Bizzle, one day…