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Assistive Listening Systems Bulletin 9C : For Providers

By United States Access Board

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Book Id: WPLBN0000703187
Format Type: PDF eBook
File Size: 273.23 KB.
Reproduction Date: 2005
Full Text

Title: Assistive Listening Systems Bulletin 9C : For Providers  
Author: United States Access Board
Language: English
Subject: Government publications, Access Board, Architectural and Transportation Barriers Compliance Board
Collections: U.S. Access Board Collection
Publication Date:
Publisher: United States Access Board


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Access Board, U. S. (n.d.). Assistive Listening Systems Bulletin 9C : For Providers. Retrieved from

Government Reference Publication

Excerpt: What are assistive listening systems (ALSs)? Assistive listening systems (ALSs) are devices designed to help people with hearing loss improve their auditory access in difficult and large-area listening situations. Typically, these devices are used in such venues as movie houses, theaters, auditoriums, convention centers, and stadiums, where they are piggybacked on a public address system. They may also be used in smaller listening locations like courtrooms, museums, classrooms, and community centers. Even though a public address (PA) system is in use, sound signals have to travel from the loudspeaker(s) to the listener?s seating position. Depending upon the particular site, this distance may be anywhere from a few feet to well over a hundred feet. Whenever sound signals travel acoustically, they lose volume over distance and are subject to distortion and masking from background noise and reverberation.


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