A student and I have beem working on a "science of electric guitars" thing. Today was us finally making a speaker/amlifier. We made a strip of kitchen foil sing. We both giggled when it worked, it's simple but frikking awesome.
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It's a pity we don't get taught the concept of impedance way earlier, given how many different places it can be applied in. For example, it's really nice to be able to see that a kazoo is very similar to an amplification circuit that's clipping. (Your post reminded me of this, because the lightness of the foil is helpful there insofar it makes for better impedance matching with air.)
