- Avantgarde-USA
 - Cumming - Manufacturers of horn loudspeaker systems designed to replicate the aural characteristics of live music. - In Concert Productions, Inc.
- Atlanta - Live audio company offering a wide variety of audio and production services.
- RTZ Audio
- Alpharetta - Builds recording microphone preamplifiers and Ampex studio recorder upgrades.
- Smart Devices, Inc.
- Norcross - Cinema sound equipment manufacturer for professional movie theatre equipment.
- On Axis Systems
- Kennesaw - Offers design, sales, and installation of audio, video, and lighting systems for churches, schools, and boardrooms.
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