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Set your Volume Reference in your theater using the pink noise generator. This should be the natural volume you used to calibrate your unit. At this volume, the Adaptive Loudness effect is null. Lower than this level, the bass level will be increased. The effect being stronger the further away you are from the Reference Level.
Enable the Adaptive Loudness in the Remote Control. You can select between 3 modes. Each has its own strength on the frequency curves applied:
Low
Medium
Full