I'm interested to know how the +4 channels are handled. Since, as pointed out above, the Trinnov has only 16 digital outputs, I assume these are analogue inputs on the 217? Also, are they just passthrough channels for analogue speakers or are there corresponding outputs available to Meridian DSP speakers. I expect we won't have answers for several weeks.

Main system - Sources (Kodi-HTPC, Vero 4k, FireTV, Sat) into Trinnov Altitude 32 (8-16) (+Roon), Trinnov Amplitude 8 amp & Vivid Audio (Giya G3, V1.5) and REL Stentor III speakers. Others: F80 + Raspberry Pi and other Pi systems.