Assistive listening systems (ALS) and assistive listening devices (ALDs) are used to amplify, transmit, and deliver sound directly to listeners from a targeted sound source. ALS and ALDs can be used alone or in conjunction with another system, such as a public address (PA) system. Individual listeners use individual receivers to pick up ALS/ALD transmissions. Receivers may be equipped with headphones, earphones, or other types of couplers to deliver the sound; in some cases individuals with certain types of personal hearing aids can use them as receivers. ALS and ALDs can help to minimize the effects of background noise, poor acoustical conditions, or distance between listeners and speakers or other sound sources. ALS/ALDs can enhance listening for many individuals who are hard of hearing or deaf, without amplifying sound to a level that is uncomfortable for other listeners.
See the section on “Assistive Listening Systems” in the chapter on “Accommodations for Deaf Individuals and Those Experiencing Hearing Loss” in the Accessible Meetings, Events, and Conferences Guide for more details about various types of ALS and ALDs.