...USB connected to Plasme TV.? I downloaded an .mp4 file and it says that it has a 5.1 sorround sound. I played it via USB and i connected it to my TV. I connected the audio out to my home theater with a cable ( i dont know what it is called but its like a RCA cable with yellow and white ) but it only produce stereo sound only the left and right are working. No sounds on center and rear speakers. Sorry for my bad english. Any help will be appreciated. TIA.