I'm not exactly sure how a MAC handles both a WiFi connection and a Wired connection at the same time. So in this case I guess I'm not sure of the definition of 'double headed'. I can report that the basic configuration works, to have a crossover cable from the Mac to the Dac, and a WiFi connection to the router. We have done so at PS Audio. In the case of this user, I can also say that we have him back online with this configuration. For the curious, it required some action with all three actors. JRiver, The PS Audio Bridge, and the MAC Mini. In JRiver there were three checkboxes in the Network Setup page that were unchecked. Then the PS Audio Bridge had a UPnP issue that had to be reset from its internal webpage. Finally, the MAC Mini got tired of all our messing around without telling us. Rebooting it was the final straw that got everyone talking and playing some great sounding music.