Essential resources

Elliott Sound Products

DIY electronics audio projects with PCBs and detailed instructions available - including amplifiers, preamps, crossovers, test equipment as well as some very informative articles.

Linkwitz Lab
Open baffle dipole speakers, DIY subwoofer
Siegfried Linkwitz is one of the most respected names in audio, and his site is one of the best resources on the web you will find

Forums

DIY audio forum

The best place to discuss all DIY audio projects. The forum attracts enthusiasts with expertise ranging from novice to world-leading experts in the field.

Home Theater Forum

This forum is huge and covers everything home theater, also with galleries.

Other links

Speaker bug - Australian supplier

An Australian supplier of speaker parts