ACT stands for Audible Contrast Threshold. It is a test designed solely to predict a hearing-impaired person’s speech-in-noise ability. ACT is not a tone test, or a speech test. Instead, it uses modulated noise signals to determine how much ‘contrast’ a client needs to hear the difference between sounds. In other words, it estimates how well the client will hear speech in noise. ACT addresses the number one complaint from people with hearing loss. hearing speech in noisy situations. With ACT, we can measure the quality of hearing and not just the level of hearing. By knowing the quality of hearing, we can confidently personalize the hearing aid fitting