Good day. I use a headless Mac Mini, late 2012 with MacOS High Sierra 10.13.2, together with a PS Audio DirectStream DAC with Bridge 2, running the latest Bridge firmware (3.4.5) and latest DAC software (Red Cloud). I typically run Audirvana+ 3.2.3 (3134) via the Mac Mini’s USB 2.0 port into the DirectStream. A Naim Uniti2 serves as the control amp, while the music library is stored on a 4 TB Synology NAS. Network connection is via Ethernet throughout - not wireless.
I only recently realised that Audirvana now offers streaming via UPnP. I typically run Roon via Bridge 2 but today decided to try Audirvana via UPnP - both using the DirectStream’s Bridge 2, as well as the Uniti2’s UPnP interface. Both show up as available audio devices under Audirvana’s Audio Setup menu.
But here’s where it gets interesting. Audirvana runs seamlessly via USB 2.0 and initially equally seamlessly via UPnP. However, as soon as you use any of the transport controls (stop, track forward, track reverse) etc. several issues arise. Among the most common, the time progress bar at the top of the Audirvana window remains at zero, even though the song plays. Also, Audirvana will only play one song in the music queue at a time, and no longer progresses to the next song in the queue.
A less frequent problem is the programme skipping two or three tracks at a time when the track forward button is selected. In extreme cases, the transport buttons stop responding completely.
One way to address the problem, albeit temporarily, is to revert to USB playback, and then back to UPnP. This seems to reset Audirvana, and everything operates normally, as long as you don’t want to stop, or skip tracks. By the way, the symptoms are the same for the albums in my own music library, and albums sourced via Tidal.
I tried to use the Naim Uniti2 for UPnP playback, but while it also works initially, skipping tracks causes even more serious problems: playback freezes completely, while the status bar on the top of the Audirvana window blanks out - with no album/track/time info, and no album artwork.
I’ve been able to replicate the problem with my 13-inch MacBook Pro, also running MacOS High Sierra and the same version and build of Audirvana. I don’t usually use the MacBook for this purpose, but wanted to check whether the issue was perhaps related to the Mac Mini, which appears not to be the case. Given that both the PS Audio Direct Stream and the Naim Uniti2 appear to suffer similar problems, is this a case of incompatibility with UPnP protocol, or a bug in this version of Audirvana?
For now, I’m going back to USB playback, which is rock solid, but the indications are that the SQ using the UPnP interface is better … I’d appreciate any feedback and suggestions!