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ADAAG Manual

Note: This document, portion of document or referenced document was published prior to the 2010 ADA Standards, and is still applicable.

Types of Systems

Assistive listening systems are generally categorized by their mode of transmission. There are hard-wired systems and three types of wireless systems: induction loop, infrared, and Fh4 radio transmission. Each has different advantages and disadvantages that can help determine which system is best for a given application. For example, an FM system may be better than an infrared system in some open-air assemblies since infrared signals can be overpowered by the sun; on the other hand an infrared system is typically a better choice than an FM system where confidential transmission is important. Recommendations: In selecting an ALS, consultation with professionals such as sound system consultants or contractors is often a good idea. No matter which technology is used, consider too that the quality of the system often determines the quality of the sound and transmission.

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