Assistive Listening System (ALS)

An assistive listening system (ALS) transmits a room's program audio directly to receivers or hearing aids — typically by induction loop, infrared or RF — so people with hearing loss can hear speech clearly without room noise.

Under the 2010 ADA Standards for Accessible Design, assembly areas where audible communication is integral to the use of the space and an audio amplification system is provided generally require an assistive listening system, with a minimum number of receivers based on seating capacity.

In commercial offices this most often affects town-hall rooms, training rooms and large presentation spaces. Requirements are confirmed with the project's design professionals and the authority having jurisdiction.

Defined by Gerson Carrillo, Director of Professional Services, D.I.S.T. · Last reviewed September 16, 2026 · Editorial policy