I am confused. In your original post you stated that the CD player and the BT were connected to the Hegel DAC, and you were comparing the sound from those 2 inputs. In your last post, you seem to indicate that you have connected the BT device digitally to the DAC of the Hegel, and that you also have connected the analog output of the BT to your preamp ( I am not familiar with the Hegel 390; for this discussion I am assuming that it is an integrated amp with DAC included). If you are comparing the analog vs the digital output of the BT, then presumably the digital output is being converted by the Hegel DAC, and the analog is being converted by the BT DAC and then being outputted to the preamp section of the Hegel. I would not expect the latter situation to sound alike.