Free online classified ads and job posting at Astanda.com
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http://www.audioholics.com/
Includes information, reviews and technical guides for equipment and accessories.
http://www.sansui.us/
Sansui Electric vintage stereo receivers and amplifiers, with company history, including international and Japanese domestic markets.
http://www.classicspeakerpages.net/
Support for acoustic research, repair and upgrade information, discussion forum, and links.
http://members.tripod.com/~Psych/index.html
Several interesting sections including comparisons of MD to cassette, DAT and CD; information about MPEG Layer 3 on the net; an MD Techie Corner and an up-to-date list of the best MD prices.
http://www.quadesl.org/
Reference source on this classic electrostatic loudspeaker.
http://www.diysubwoofers.org/
Includes information on designing and building subwoofers.
http://t-linespeakers.org
A collection of DIY Transmission Line Speaker projects.
http://www.tunetorials.com
Free video tutorials covering music production and popular music software like Reason, Live and FL Studio.
http://www.angelfire.com/vt/audio/
Wades Audio And Tube PageDiscussion of vacuum tube audio amplifiers and high fidelity equipment with photos and schematic diagrams.
http://www.geocities.com/mghjch02/
Passive 2-way crossover spreadsheet design tool. Models allow complex speaker impedance, acoustic target shapes, series or parallel designs, and impedance compensation circuits.
Discussion forum for information, classifieds, photos, and general know-how regarding analog and modular synthesizers.
http://www.yesterdaysjukes.com
Yesterdays Jukes1950s Jukebox repairers and parts supplier, specialising in Seeburg machines.
http://www.zerogain.com/
Offers several discussion forums, articles, news and photos. Includes registration details.
http://www.hifiloudspeakers.info/
Provides information about early KEF speaker drive units, cabinets and crossovers and provides a forum facility for people interested in KEF speakers.
http://members.optusnet.com.au/~gradds55/
DIY Speaker site that displays a number of non-rectangular DIY speaker projects. There are also some nice primers on how to construct curved speaker enclosures and creating crossovers.