- Manley Laboratories, Inc.
 - Chino - Sonance
- San Clemente - Products for home theatre, multi-room audio, and other unique audio/video applications for your home or business.
- Anchor Audio
- Torrance - Portable audio and public address sound systems, lecterns, and amplifiers for reinforcement of music, speeches, seminars, presentations, video, emergency audio, and other music and voice applications.
- AudioQuest
- San Clemente - Makers of speaker, video, and power cables.
- Theta Digital
- Agoura Hills - Product line features outboard digital-to-analogue converters, DVD transport units, and modular surround sound processors and amplifiers.
- Acoustic Image
- Studio City - High end audio shop in California specialising in tube and analogue stereophonic equipment.
- Renkus-Heinz
- Irvine - Manufactures loudspeakers, amplifiers, speaker controllers, complete sound systems, woofers, compression drivers, and acoustic simulation software.
- Revel Corporation
- Northridge - Loudspeaker company.
- Vacuum Tube Logic (VTL)
- Chino - Makes audio components including monoblocks, stereo amplifiers, and preamplifiers.
- Royer Microphones
- Burbank - Manufactures ribbon microphones for professional recording.
- Audire, Inc.
- Fountain Valley - Manufacturer of high-end audio hardware.
- Sprague Magnetics Inc.
- Sylmar - Repair depot and parts supplier to the professional audio and computer maintenance industries.
- Professional Sound Corporation
- Valencia - Professional sound community with accessories for location sound recording.
- Sye Mitchell Sound Company
- Woodland Hills - Broker of new, used, and vintage pro audio recording equipment
- Filament Pro-Audio/Lighting
- San Dimas - Serving the recording, re-enforcement, theatrical, church, club, and broadcast industry since 1968.
- Sprocket Development
- Los Angeles - Audio Manufacturers sharing technology. Walk down Digital Audio 'Memory Lane'. Updates/Demos for Apogee, Avid, Digidesign, Lexicon, SonicSolutions, Studer. Tell us your technical problems.
- Audio Rents
- Hollywood - Audio equipment rental company serving the film, video and music business in the U.S. and Canada.
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