Are you trying to send audio from HK AVR154 to your computer and onto the internet?
Are you trying to play audio from your PC through your HK AVR154 to listen to it?
I cannot figure out how to connect my pc to stereo receiver in order to stream audio. I am on my second audio/video receiver, which replaced an older stereo receiver. Currently using a Harmon Kardon AVR154, which I imagine is new / good enough for no need to convert digital-to-analog, as it is a digital receiver. I have tried connecting both audio composite cables and digital coaxial cable from the pc internal soundboard, an ASUS M4A785-M, with an added S/PDIF module connection. Do I need to upgrade the pc with an additional internal audio card?