I have found a superior way to stream audio on the Bose 700, and it runs like this. Tidal Hifi -> Nvidia Shield Pro -> Vizio TV -> Bose 700. This sounds better than every other audio streaming, including Bose's music app.
I believe that what's happening is the FLAC file is getting recoded into DD AC-3, which would typically always be compressed, and both FLAC and AC-3 would be capable of 16-bit, 44 khz audio. But since it's just a conversion, am I getting the equivalent of what would be uncompressed AC-3?
I think there is a lot of wonder in the community what the Bose 700 does with various forms of stereo formats, such as FLAC, Vorbis, MP3, Wav. I believe it's converting them all the AC-3.