This is why you can have two hearing aids that are better than one.You can hear better in noisy environments: If the signal arrives at an ear at a different time, you may be able to improve your hearing. The brain can process speech signals more efficiently if there is a time difference.Better signal to noise ratio: The sound source is important. If your hearing aid is in your left ear but the person talking to you is in your right, most of the speech signal will be lost before it reaches your aided ears. However, the normal level of noise enters your aided and remains there.Increased capability to locate sounds. The brain analyzes the sound coming in from both the left and right sides of the head to identify the source of the sound. This sense of direction can be altered if a hearing aid is worn in one ear.