Sounds like a brilliant idea.By that I mean it would be a brilliant idea for you to take your meds.
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I wish I has some ideas for you. It seems to me it's going to end up being more like a small "speaker" than a headphone driver... perhaps I'm being naive and they are more similar than different, but I think I'd be looking for a really good small speaker to put in there. I know one of the engineers from the project post here occasionally, perhaps he can offer something up to help?