content: There are a lot of DIY speaker building resources out there, many using components from Parts Express, MCM Electronics, Madisound, or Monoprice.  An old listing of free speaker designs is here http://techtalk.parts-express.com/forum/tech-talk-forum/30395-links-to-existing-diy-speaker-designs A useful forum is http://www.diyaudio.com/forums/loudspeakers/ There is a new kind tuned speaker that is technically patented but you can see how it works here http://www.hometheatershack.com/forums/diy-speakers/158634-k-bas-hybrid-enclosure-real-marketing.html