I currently own two Zenith music streamers, both of which are located in my house, that are never connected to the network at the same time. My Nuprime IDA-8 DAC just came back from the dealer, who said he could find nothing amiss. Both my POLK floor speakers have audio (hiss) when connected to a standalone stereo receiver. The issue that has me stumped is that when I connect either streamer to Roon and click on a music file, audio comes from my Macbook Air (Roon Core), but not from either of my two streamers after clicking on the IDA-8 icon in Roon (lower right hand corner of the screen). Can anyone offer a solution?