Sony HT-A3000 Help Manual page 88

You can compress the dynamic range of the audio signal to make it easier to hear quieter sounds.
[Auto]: Automatically compresses sound encoded in Dolby TrueHD.
[On]: Reproduces the Dolby and DTS sound track with the kind of dynamic range that the recording engineer intended.
[Off]: No compression of dynamic range.
[Advanced Auto Volume]
You can reduce the difference of volume due to the input signal. This function is effective when the volume of a TV
commercial is louder than that of the TV program.
[On]: Adjusts the volume automatically.
[Off]: Off
Note
Advanced Auto Volume function is not suitable for listening to music.
Related Topic
Enjoying Surround Effect (SOUND FIELD)
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