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Reminds me of an experiment my dad worked on a while ago. He was doing something that required redshifting lasers or maybe blueshifting. I don't really remember the details, but it involved going to a very high end stereo shop and buying one of their most expensive woofers. But he only needed one, and they refused to sell him just one speaker, because it was a stereo store and they sold speakers in pairs.
He got the speaker back to the lab, and epoxied a mirror to the cone. Then when he shined a laser at the mirror, he could use some tone generator to run a specific signal through the speaker to get the laser to shift its wavelength or something like that.
It seems like a pretty neat solution to me. And also a travesty that he destroyed this really expensive high end set of woofers.
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