Using Audirvana’s UPnP to play music via an Allo DigiOne running GMRender, Tidal MQA files somehow lose their integrity for a decoder connected by SPDIF. When I play these same files using Roon, the DigiOne happily outputs MQA for decoding. Same equipment and physical connections, but no MQA for the decoder when coming from Audirvana.
Note that Audirvana’s UPnP does successfully play Tidal MQA if I use a different RPi3 endpoint, also running GMRender, when connected by USB to either of two MQA-capable DACs. Curious.