FM IR Manufacturers and Installers hearingloop.org cannot identify all firms who sell products, nor can it evaluate the quality of their products or services. Equipment Manufacturers and InstallersMany of the following companies can direct you to recommended designers and installers of their products. Ampetronic, British manufacturerBo Edin, Swedish manufacturer of UnivoxContacta Inc., Florida-based and UK manufacturerListen Technologies, Utah-based American manufacturerWilliamsAV, Minnesota based American manufacturer ProductsCatalogs and stores that sell receivers, headphones, and neckloops (this website)