• Not normally susceptible to radio or electrical equipment interference.

NB: For listeners who use an FM receiver equipped with a neck-loop along with his or her hearing aid/implant T-Coil), it is possible that the T-coil might pick up electromagnetic interference if it is present in the room.  Care should be taken to reduce/eliminate spurious electromagnetic interference in the room prior to the installation of an FM system.

• Multiple languages can run simultaneously without interfering with one another.

• More Privacy as signal does not travel through solid surfaces (windows must be covered).

• Emitter panels can be interconnected to provide coverage for large areas.

• Require receivers for everyone.

• Both headphone output and neck-loop listening devices must be available at public facilities.

• Facility owners are required to maintain, clean, dispense, collect receivers and keep receiver batteries charged.

• Not practical for outdoor applications (sunlight interference).

• A sufficient number of emitters must be installed to ensure that objects in the room (columns, chairs, etc.) do not interfere with signal transmission as IR energy travels in straight lines, requiring “line of sight” between the emitters and the photosensitive cells on the listener’s receiver. Listeners also need to be advised to wear the receiver with the photosensitive cell facing out into the room in order not to block the cell with clothing etc.

• More costly and challenging to cover very large seating areas (e.g., stadiums).