I'm using the 2 ch stereo output from the BD390.
That goes into my analog receiver which then goes to my stereo speakers.
I noticed that the quality of the sound from the stereo output is really bad - music sounds bad, movies sound bad, everything sounds bad. I can't hear dialogue easily in movies and music sounds flat.
I have another DVD player (Pioneer DV-410V-K) and it sounds great with my same receiver and speakers - so it's not my audio equipment.
Receiver is Sony STR-DH100.
Speakers are Polk Audio Tsi100.
I'm considering eBaying my BD390 because of poor quality sound.