MacMini –> Audirvana 3.5 –> Sonarworks –> UpnP –> Golds (DOS2) = BLISS!

[Pwalder]

Thanks for the response. When I click on the little wifi speaker I don't see any item relating to the Phantoms. By default it just has Built-in Output and Kef X300A (which are my desktop speakers) so there is no available dialogue. If I go into the Macs Audio Output settings I do see the name of the Phantom stereo pair which in my case is 'Living room' the audio does indeed get played through the Phantoms and if I now click on the wifi speaker in Audiovarna it does show an output option of 'Living room' bu clicking on the '>' whilst showing additional information doesn't show any options relating to UPnP. When the audio is playing through the Phantoms the Mac does show it is using Airplay so at the moment I still seem stuck. Any other ideas?
Thanks again