Am I right in thinking also that only a Meridian 210/218 will allow you to control the volume on DSPs? i.e. something like a Bluesound Node 2i won't control volume from the app?
The Bluesound Node 2i will not integrate quite as completely into the Meridian world.
HOWEVER, it offers several advantages over a Bluetooth device or other streamers (although it does have Bluetooth as well).
It has a proprietary variable coax digital output that will allow you to change the volume out to your DSP in the BluOS app on your device. Very convenient.
It will also do the first unfold of MQA and output 24/96 to your DSP which provides a lot of MQA’s benefits.
It also does Amazon Music natively within the BluOS app as well as Apple Airplay2.
It is a very good sounding streamer in it’s own right. May not be quite as good as 210, but it’s half the cost or less if you find used or refurb. And would allow you to compare the sound of all of the above, including the 24/96 first unfold of MQA.
It can easily be sold on if you decide to go 210. Just my 0.02.