- Dan Dugan Sound Design
 - San Francisco - Digidesign
- Palo Alto - Designer of Pro Tools, MIDI compatible sequencing, notation and digital audio recording software. Also offers pro audio sound cards and systems.
- KABA Audio Productions
- Novato - Full service audio duplicator specialising in cassettes, CDs and graphic design. We manufacture the professional Real Time Duplication System.
- Leo's Professional Audio
- San Francisco - Electronics and equipment for musicians.
- Muse Magic
- San Francisco - Engineering consulting company providing expertise in audio algorithm implementation and related topics.
- Paradise Sound
- San Jose
- Riverview Systems Group, Inc.
- San Jose - Offers audio-visual services, theatrical lighting, and staging for permanent installation, tradeshows, and events.
- San Francisco Audio
- San Francisco - Designs and installs sound systems.
- San Francisco Stereo & Theater Systems
- San Francisco - Providing clients with the quality service and performance in home entertainment.
- Spectral Audio
- Santa Clara
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