The best way I can describe this is to show an example. From this link http://www.newsearching.com/tvs/Phil...elevision.html "SmartSound also keeps consistent volume levels between programs and commercials, and from one channel to another. " Smartsound will not let the volume go higher (or lower, I think) than a certain DB no matter what signal it is fed. I would really like to have something like this (without having to buy a new TV and that will work on my 5.1 system) when watching DVD's late at night so I do not wake up my family. I have a "separates" system if that matters and the "midnight mode" is not enough. Midnight mode really only lowers loud blasts a little, it does not "level" the entire spectrum. Meaning many things are still too low to hear, but when a loud crash comes through it is still too loud. The way I see it I would need some device that could connect inbetween my DVD player and my preamp. It would have to "normalize" the digital stream in real time to a certain DB level before it hit the preamp. Or if there is some other way to do this? I would love to hear how.