Loudness

How Loudness Normalization Keeps Audio Volume More Consistent

You may play two songs at the same volume setting and find that one sounds much louder than the other. The same thing can happen when moving between videos, podcasts, or other audio. Reaching for the volume control each time is inconvenient, so many playback systems offer some form of loudness normalization. Loudness normalization tries to make different pieces of audio start from a more consistent perceived loudness. It does not flatten every quiet and loud moment into one level, and it does not guarantee that every recording will sound identical in volume.