An Assistive Listening System (ALS) is a system that helps people with hearing loss hear better in group situations. ALSs provide the same kinds of benefits as ALDs, but ALS usually refers to amplification or transmission devices which transmit sound throughout a room, auditorium, theater, classroom or church for the benefit of members of the audience who have a hearing loss, rather than as a personal device for just one individual.

ALSs usually use FM or IR to transmit the signal from the transmitter to the receivers.

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