5dot1.com [more]
Promotes the use of surround sound and multi-channel audio systems. Sites includes information on how to listen to and record for 5.1 surround sound, articles of Dolby Digital, DTS and using AC-3 on CD-R discs.
http://www.5dot1.com/

Audio Ideas Guide [more]
Hi-fi and Home Theater e-zines. Reviews, news, articles, tweaks, and other audiophile resources.
http://www.audio-ideas.com/

Audio Review [more]
Offers consumer-generated product reviews, ratings, prices for brands and models.
http://www.audioreview.com/

Audioed Resources Site [more]
Offers educational resources for the International sound recording community.
http://www.audioed.com.au/

AudioKarma [more]
Focused to stereo high-fidelity, including tube audio, home theater, and especially vintage 1970s gear, even vintage TV receivers. Site offers discussion forums, help, and general information for the audio enthusiast.
http://www.audiokarma.org/

AudioNova [more]
Audio resource for manufacturers, forums, magazines and journals.
http://www.audionova.nu/

AudioWorld [more]
Audio industry, news, reviews, ratings, references, company directory, and cross reference.
http://www.audioworld.com/

HeadRoom [more]
Offers reviews and evaluations of headphone equipment. Includes a buyers guide.
http://headroom.headphone.com/layout.php

Home Theater Discussion Forum [more]
Database of home theater information, set-up hints and buyers guides.
http://www.smr-archive.com/

Los Angeles Audio File [more]
Home theater and audio community with product reviews.
http://www.laaudiofile.com/

Remote Central [more]
Information on mid- to high-end universal remote controls: product reviews; message forums.
http://www.remotecentral.com/

Retro hi-fi [more]
A vintage high-fidelity portal for discussing and displaying classic and vintage amplifiers, tuners, turntables such as Thorens, Quad, and pick-up arms. Also, provides a classified listings.
http://www.retrohifi.co.uk/

Sonic State [more]
The music and pro-audio theme park. Features classifieds, synth site, directory, and chat.
http://www.sonicstate.com/

The Audioholics [more]
Includes information, reviews and technical guides for equipment and accessories.
http://www.audioholics.com/

Tuner Information Center [more]
Focused on vintage stereo tuners. Reviews of tuners, explanations of how tuners work, explains about tube tuners, and notes alleged fraudulent online auctions.
http://www.fmtunerinfo.com/

Useful Audio Potpourri, A [more]
Focuses on indoor FM antenna design and a Hafler circuit for surround sound. Also, includes a directory of related links.
http://members.tripod.com/martin_leese/Audio/

Wired 4 Music [more]
Resource of information on Super Audio CD, DVD-A, DSD, Surround. Practical tips on hi-res recording and 5.1 surround.
http://www.wired4music.com/