Hi I am not an audiophile claiming to hear unhearable. I never minded mp3 128kbit/s as source like it was back in the 1990s, I can't hear difference between this and flac. I listen to music mostly from mp3 on android box through coaxial or toslink lead to Cambridge DAC to amp. I have added recently a bluetooth adaptor to the Cambridge DAC Plus and I really notice inferior quality of bluetooth streamed music as opposed to along toslink cable. To me sound is also better through analog RCA cable straight from my telephone to the amplifier so using the phone's internal DAC. The bluetooth sound is washed out, muffled. I wonder if anyone has noticed the same?