ALDs prove useful in three major areas. They help individuals with hearing loss overcome the following obstacles.
Because sound fades over distance, the farther away the sound source, the more difficult it is for a person with a hearing impairment to understand what is being said.
Background noise is a distraction that limits the ability of persons with hearing loss to understand what is being said and follow along with conversations. This can take the form of other people talking as well as noisy ventilation systems, televisions, traffic noise, rustling papers, and more.
The shape of the room can affect your ability to hear clearly. Sound waves bounce off hard surfaces, leading to reverberation and distortion. Large, open spaces or rooms void of furniture make especially poor acoustical environments.
Simply turning up the volume on your hearing aids will not offer much improvement, because all the volume will be increased, including background noise. ALDs such as FM transmitters help to overcome this problem by separating the competing sounds and boosting the volume on the speaker only. They are most helpful in business meetings, classroom lectures, movies, restaurants, and churches.