The audio was perfect, as far as I could tell.
there's a rather complicated audio-engineering issue there;
audio does not behave in a linear fashion when changing "loudness". over a spectrum of frequencies, when you change X energy to 2X energy, some parts of the spectrum will have deformed.
Also, our ears do not respond the same way to every frequency. Thus, mixing sounds for loud playback situation, and mixing the same for soft - such as TV playback - require specific changes.
I have noticed that in several DVD releases i had watched, the audio is still the cinema audio, and it sounds bad. For example, the bass is really overpowering and deep. The voice sounds hidden by the other sounds. The whole spectrum sounds dull and muffled.
This is because high frequencies sound too shrill when the volume is too loud, so on a cinema mix, you cut these. Midrange - where human voice is located - is much easier to hear (we have developed so that it's easy for us to hear other humans speak to us), so in the cinema mix you don't need as much. Low notes at a higher volume level need much more energy to stay consistent, so you need to pump those; once you play these in a home system, they sound like shit, because the values are proportionate when played at cinema volume, not at home volume.
The quality of the speakers has nothing to do with this(but it can make things worse).