Information on mid- to high-end universal remote controls: product reviews; message forums.

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.

The music and pro-audio theme park. Features classifieds, synth site, directory, and chat.

Includes information, reviews and technical guides for equipment and accessories.

Focused on vintage FM stereo tuners. Reviews, explanations of how tuners work, explains about tube tuners, and notes on alleged fraudulent online auctions.

Focuses on indoor FM antenna design and a Hafler circuit for surround sound. Also, includes a directory of related links.