Modas, the problem is one of compression. Your DVD player may have the solution to this -- check through the settings for a Compression or Audio Compression feature.
One of the big differences between broadcast television and a theater is that the television audio is more heavily compressed -- the range between the lowest and highest volume levels is reduced (and then on some channels you set the maximum volume to 80 percent of signal and the commercials at 100%). This way the television provides a constant chatter and a manageable volume in a house where other things are going on.
If you've got a good sound reproduction system, and are able to watch a movie like a movie rather than having it on while other things are transpiring, the full range is actually desirable. Moreover, if you've got a processor on the DVD player that's reading the audio, you can stick a compressor in there too, so DVDs have been mixed that way.
