Mike - Please feel free to correct me if wrong, but I don't believe that Bluetooth maintains the same quality which Tidal HiFi provides (CD quality 16/44.1). I would have to assume that when Tidal functionality is added to the KEF LS50 app it would maintain Tidal's level of resolution.
I'm actually not sure, but I thought it was at least 16/44.
My guess is that they want to have a much more robust app. Launch Tidal, control volume, etc.
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