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.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner
TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv
Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner