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Personal sound amplification devices, or PSAPs, amplify sound waves for those who have normal hearing, or hearing thresholds of 20 dB or better in both ears.

Johner Images/Getty Images Personal sound amplification devices, or PSAPs, amplify sound waves for those who have normal hearing, or hearing thresholds of 20 dB or better in both ears. Unlike hearing aids, hearing amplifiers are not personalized for each user or clinically prescribed, but offer a number of customization settings and potential mobile app integration.  PSAPs are good for quieter environments where you want to increase your hearing range or extent, a...