I have bought a Audinate AVIO Bluetooth Adapter to attach my iPad with via Bluetooth instead of a cable.... I hoped when using Spotify the m4a audio-stream whould be bassed through so I would not encounter any quality loose while using music from spotify or any other m4a source, but no.
So just to give everyone an idea between normal audio-playback (just direct recording via Screenflow Computer Audio recording) and a recording via Dante Virtual-Soundcard from that captures audio from the Dante-Bluetooth Adapter.
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1st 30sec are the orig. Audio
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2nd 30sec are the captured bluetooth audio
Audio-Levels of the bluetooth recording are a bit alterered due to the adapters low output-level (audio was @100% on the iPhone during playback)
Orig. Wav file played back is from here