British audio design. Includes products and online purchase.

Collects information on past and present models of Hi-Fi and recording equipment along with links to, history and contact information for companies and individuals active in the field.

Support for acoustic research, repair and upgrade information, discussion forum, and links.

A thorough unofficial resource for Nakamichi tape decks.

Reference source on this classic electrostatic loudspeaker.

Roger was former Director of Acoustic Research for McIntosh Labs. Offers information and photos of McIntosh equipment.