Hello, I hope someone here will help me because the question is too much for the most shop salesmen I have to make a connection between Creative SB Live 5.1 -> Home theatre system LG LH D 6540D The signal is at the digital out of the SB. It has a adapter to RCA female My receiver has COAXIAL DIGITAL IN input. The distance is 15 meters. What cable do I need? A coaxial 75Ohm, 50 Ohm? Or some other type of cable?