The greatest advantages of infrared are being able to use your own receiver with public transmitters (like in movie theatres) and getting the best sound reproduction. Because of their superior sound reproduction, they are often used movies, plays and musical productions. They may not be the best system for profound hearing losses as they lack the acoustic output (loudness) of FM systems. On the other hand, they also present less risk of injury.
Infrared systems are secure systems because the signal will not leave the room. Thus, it is the system of choice for jury deliberations and business meetings that need to protect discussions (e.g., around development of new materials or software).
Because light does not transmit through walls, multiple systems can be used within a building. With the exception of high frequency lights and bright sunlight, there are few sources of interference with infrared systems.
