- Shure Brothers Incorporated
 - Evanston - Microphones, wireless microphone systems, sound reinforcement, mixers, teleconferencing, and phono cartridges. - AmpliVox
- Northbrook - Manufacturer of portable public address systems, amplifiers, 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.
- 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.
- Wizdum Audio, Inc
- Chicago - Specialising in sound system design, installation, and rentals for houses of worship, municipalities, schools, and businesses.
- Bridgewater Custom Sound
- South Holland - Provides professional audio and video sales and rentals. Designs, installs, and services audio systems organisations.
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