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DRC (Dynamic Range Compression) is an audio manipulation technique. High quality audio, such as those found on DVDs, have great dynamic range. This means the volume lows are very low (for example, dialogue), and the highs are very high (for example, explosions). On a high end sound system, one will be able to enjoy the dynamic range of the soundtrack, but on a low-end system, this means the lows (dialogue mainly) will be hard to hear, and if you increase the volume, then the highs (action/sound effects) will be too lound. DRC compresses (reduces) the dynamic range, so that highs are lower and lows are a bit higher, making volume to be more constant. Sound system with "late night modes" use DRC to "even" out the audio volume.