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Originally Posted by Serum
Cool.
I made a magnet-less speakers, using a speaker that didn't used a magnet, made two windings, working in opposite phase to make the voicecoil move.
I find it hard to believe though that it's about the same efficiency than a parmanent magnet type, because the magnets nowadays are unbelievable strong and this is 'free energy' I'll dig into it a bit deeper when i get back from work. If it is the case; nice piece of engineering.
They won't have got as much torque in a little can such as an RC motor with a permanent magnet though.
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A bit off-topic but are you familiar with "servo-drive" speakers?