I'm using my iPhone as a streamer for the time being. I can connect it via the USB input of my Marantz CD player and it works. I would like to use the USB input on the back of the Yamaha integrated instead. When I connect it, the sound only comes out of the phone. I tried it on my secondary system which uses an external DAC that I connect my computer to, which works but I get the same results when I try connecting the phone directly to the DAC. What am I doing wrong??