I currently have a jbl lsr 305 bookshelf speakers(can be connected by xlr and trs ) and i wanted to make the setup wireless ,so i bought a google chromecast audio(which have hybrid 3.5mm optical port) .However i want to connect the chromecast audio to my o2 Sdac combo(which have an usb input and a rca output for the dac portion.) from massdrop then output to the speakers. May i have some advice of how i am suppose to do it? and what accessories or adapters i need to pick up? Appreciated if help is received!