I had a sound problem with my Jensen unit last night. I was playing a Blue-Ray DVD movie on my PS3 and had everything set to play the audio through the Jensen. I was getting all the background sounds but there was no voice when their lips were moving.
Went into the PS3 settings and found it was set to output Dolby 5.1 (as my home theatre is 5.1 and the voices usually play from the Centre speaker). I changed the setting to Dolby 2.0 and then I got all the movie sound track
Guess the Jensen only supports Dolby 2.0