For a design, I've been looking at the "Hi-Vi B3S single driver system" here: http://www.zaphaudio.com/audio-speaker18.html , but I'm looking for other suggestions. Anybody got any? The main design parameters are small, simple and cheap.

• The Bathouse Is Up and Waiting for Tenants

I think both the HiVi and TB projects work out to be the same cost. The HiVi drivers are cheaper, but requires more filter components.

Gar.

• Tangband Projects

• Audio Crafters Guild oneZ loudspeaker

Ironically, I had bookmarked the Tang Band project years ago and went there to take another look at it -- and found it replaced with the Hi-Vi project.

• Introducing The Barn Owl Nest Box Project

See especially posts on The Brick... not the smallest, but should
make music from an audio stream.

For small projects, the "Onken" has always appealed to me
for it's elegance:

• Solo 103

Lots of flourish. Reminds me of the only Seinfeld episode
I ever watched in which they were sending up catalog descriptions
of things.