Is the Blu-ray player a BDP-S550? I could not find any detail on the S55. If it is the S550 then you should connect the audio using either an Optical cable or a digital coax cable. The optical cable only fits into one of the optical ports and the digital coax cable is orange colored at the end. Once you connect the audio make a note of which port you used. You will have to go into the 950 menu and tell the system which audio port you used for the S550. That way when you put in a disc the video and audio are synceh together through the 950.