Mark K's testing page. A great resource with tons of data and useful info.

http://www.markk.claub.net/

John's audio projects page. Again, plenty of driver info and diy kits.

http://www.zaphaudio.com

Siegfried Linkwitz's homepage. The original, and still one of the best diy audio sites out there.

http://linkwitzlab.com

Another great loudspeaker test and review site.

http://www.mfk-projects.com/index.htm

The old Usher audio North American distributor website. Has some great Speaker reviews here.

http://web.archive.org/web/200402050...w.euphase.com/

A great compilation of diy projects:

http://home1.stofanet.dk/troels.gravesen/