kennish@janus.Berkeley.EDU (Ken A. Nishimura) (09/17/89)
I have noticed that certain symphony halls/opera houses are outfitted with IR listening devices for the hearing impaired. (Sennheiser comes to mind). Does anyone know if they are IR, or RF. Are the similar to the Koss wireless headphones? I am curious to know what kind of modulation they use and the frequencies. Will summarize and post if information forthcomes. -ken