I don’t own any Naim products yet; I’d like to know what the maximum multi-room group size that naim supports? For example, how many uniti atoms can be grouped together for multiform playback: for Spotify whole-home listening (same track to all atoms).
And does this differ based on connection (wifi or ethernet)?
You can have up to 5 streamers in a multiroom group. How well this works will depend on the quality of your network, and Naim used to recommend that you have no more than one wireless leg in a multiroom group with the old streamers, but the current models have better WiFi performance so may be less limited in this respect.
If the Uniti Atom is the master then it supports up to 8 multiroom rooms including itself. Wifi vs Wired is the same, but if the wifi reception has issues then it may need the master wired on ethernet to make it work reliably. On the Naim solution we don’t reduce the audio quality as number of rooms are added, which means that it puts more stress on the network.
I have 3 wired access points (272/Atom/Muso Gen 1) and apart from the odd network issue occasionally all work reasonably well. I generally use the Atom as the master if I’m streaming to all 3.