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Who says speakers are for music? A speaker is a multi-purpose device as shown here.
“The engineers way to shake a milkshake.
Take a powerful DC amplifier, connect it to a large woofer, feed
the system with a signal generator, and at the end, just add milkshake. Of course it is also possible to measure the g-force
of the shaking 😉 ”
Thanks Steinar
