I have a Bose lifestyle surround sound system with a subwoofer and five sets of mini cubes. I've inherited a Sony flat screen TV that only has an HDMI jack on the back. The Bose system has RCA cables. Help! I don't watch cable or satellite TV just want to be able to watch movies on this system. Currently have a BlueRay player hooked up the TV. Don't know how to sequence that in either.