Sound Amplifier allows you to adjust frequencies to customize sound from your headphones, allowing you to emphasize foreground sounds and minimize background noise. The feature now also shows a green visualization that displays real-time audio, so you can adjust how much sound you want to reduce or boost.
These customizations can be especially helpful when you enter different environments, such as a noisy concert, restaurant, movie theater, or during busy commutes. Sound Amplifier support is available for phones with Android 6 Marshmallow and later starting today.
According to theverge