Would like your advice on the following: I have a Asus F8Vr notebook that has hdmi port for video and sound which I connect to my HDTV. However my AV amp does not support HDMI and I understand that the SPDIF cum headphone port can be used to output audio to the AV amp. I can only find RCA cables to connect from SPDIF to my AV and as such can only get analogue. Is there a cable that I can get to get connected to my AV amp coaxial or optical to get digital dolby srround or dts?