The Audio Dictionary is a comprehensive resource, including historical, obsolete, and obscure as well as contemporary terms relating to diverse aspects of audio such as film and TV sound, recording, Hi-Fi, and acoustics.

The Third Edition includes four hundred new entries, such as AAC (advanced audio coding), lip synch, metadata, MP3, and satellite radio. Every term from previous editions has been reconsidered and often rewritten. Guest entries are by Dennis Bohn, cofounder and head of research and development at Rane Corporation, and film sound expert Larry Blake, whose credits include Erin Brockovich and Ocean's Eleven. The appendixes—tutorials that gather a lifetime's worth of experience in acoustics—include both new and greatly expanded articles.