The Bravia DAV-DZ home cinema range incorporate a 'Night Mode'. Sony claims this allows actors’ speech to remain clear, while ensuring that the volume of sudden noises are suppressed.
Range-limiting systems are not new. Many DVD players have a 'night-mode' that uses Dolby encoded information to compress the dynamic range of film soundtracks. Sony don't give any details as to whether the DAV-DZ range is using a cleverer system, but in my experience any kind of dynamic range limiting also ruins the 'feel' of the audio.
If you need to listen to a film at lower volume levels, it is often better to choose the 'stereo' or '2-channel' option (if there is one) in the DVD's menu setup.
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