I have a 5.1 surround setup in the ceiling with 3 speakers in the front and 2 in the back. During the setup process all 5 speakers are recognized and even using the manual test tone option they all produce sound. However, when I play a Dolby 5.1 sound test from YouTube, when its time for the surround back speakers to make noise, the sound comes out of the front left and right. essentially it acts like a 3.1 system. I thought it was a YouTube thing so I found an mp3 file for the 5.1 test and still the same result. I checked the setting on my older Vizio 1080p TV and it is set for surround sound. I need help, this is the 1st surround sound system that I have ever had so I have no clue what could cause this issue...