Black levels seem nicely deep and dark, and shadow detail appears appropriately opaque but not overly so. Also very good is the film's Dolby Digital 5.1 mix. The soundfield isn't overly ambitious, but it provides a fairly full image. The front channels dominate and offer sound that's spread broadly across those speakers. The surrounds tend to mainly bolster the music, with some occasional but rare effects as well.
Sound quality seems consistently excellent.
Dialogue appears clear and natural, with no intelligibility problems. Effects are clean and realistic, and the music seems full and bright, with strong dynamic range. If the quality displayed any faults, I couldn't find them. All in all, The Sixth Sense offers a fine audio experience. Most of what we find comes from video interviews with many of the main participants.