- Afab Enterprises, Inc.
 - Frankfort - Specialises in audio, video, and custom cables. - AmpliVox
- Northbrook - Manufactures and markets portable sound systems, wireless remote powered speaker systems, and lecterns with built-in sound system.
- Atkinson Dynamics Intercoms
- University Park - Offers intercoms, communication systems, speakers, and auxilliary signalling products.
- Audio Supply, Inc.
- Mundelein - Audio equipment and supplies dealer offering technical support, audio systems design and equipment for commercial, residential, indoor, and outdoor needs.
- Bridgewater Custom Sound
- South Holland - Provides professional audio and video sales and rentals. Designs, installs, and services audio systems organisations.
- Brown Innovations, Inc
- Chicago - Featuring the Virtual Audio Imager, a set of 'Virtual' headphones: Step under and into an acoustic world. Step out and the sound disappears.
- Esdale Commercial Sound, Inc.
- Highland Park - Audio system design and installtion services for schools, houses of worship, athletic faciities, and more.
- Gap Digital
- Wheaton - Suppliers of equipment and services.
- Larry McGee Company
- Buffalo Grove - Designs and manufactures industrial voice communications and control systems, including intercoms, consoles, radio monitor and PA systems, and radio testers.
- Shure Brothers Incorporated
- Evanston - Microphones, wireless microphone systems, sound reinforcement, mixers, teleconferencing, and phono cartridges.
- Wizdum Audio, Inc
- Chicago - Specialising in sound system design, installation, and rentals for houses of worship, municipalities, schools, and businesses.
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