I’ve been working on an embedded speaker design off and on for the last few years, and finally got around to posting an Instructable for it.
[vimeo]https://vimeo.com/123688585[/vimeo]
I created knitted and non-knitted versions, and am quite happy with how it turned out. The secret is using dipolar magnets and hard drive magnets are a cheap way to do this. (Plus, a really big amp.)
[vimeo]https://vimeo.com/123688584[/vimeo]
Props to Sache for lending her glue and paper expertise!