I must admit i don't get this 'isolating' my separate switch concept.
I don't get it either, Simon, and I think it's become something of an urban myth.
Isolating audio traffic on my network simply isn't possible due to the plethora of connected devices, all of which at some point must share the same Cat5E backbone. So, even with a "dedicated" switch, the audio traffic is not truly isolated.
It's much easier to do this if the only thing you have at the end of the spur from your main router/switch is your streamer, but for me that is not the case. Perhaps that is how the majority here have their networks set up, which makes this notion of isolation more tangible.
From a configuration perspective, using subnets for audio is complete overkill and even setting up a VLAN for audio isn't really worth the effort in a domestic environment.
The idea that I should daisychain a second 8-port switch to the existing gig Ethernet switch just to "isolate" the NDS doesn't make sense to me, and I don't want the unnecessary clutter and the need to accommodate yet another power socket.
Perhaps I'll just play an LP on the RP8...