I had heard of Pi speakers but didn't give them much attention until I read this article. Very nice looking stuff, I would love to hear some of these. There just isn't a lot of high sensitivity speakers for home audio, I guess its because high sensitivity speakers have to be so big. Some of the documents on the Pi website are interesting, I am going through the Pi speaker whitepaper and the JBL Sound System Design Reference Manual, and learning a lot of stuff from both, very interesting.