I do neuropsych research using fMRI, and I often use piezos to provide vibrotactile stimulation since they can be safely used inside the scanner. I've been experimenting with using them to replace the headphones we currently use (the headset part connects to long tubes which are in turn connected to speakers that are a safe distance from the scanner, they kind of suck). The ones that I'm using provide full range sound and actually sound pretty good, even with the heat shrink covering I put on them. They cost $200 a piece though, which is kind of expensive for a diy project. The company also sells smaller, cheaper piezos in a variety of sizes that might work. Here's the ones I'm using:
http://www.piezo.com/prodbm7qm.html
I've noticed that you get much better low frequency performance if you strap them to your jaw and rely on bone conduction rather that put them directly over your ears.
http://www.piezo.com/prodbm7qm.html
I've noticed that you get much better low frequency performance if you strap them to your jaw and rely on bone conduction rather that put them directly over your ears.
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