Hi WJE. I use it as main DAC for listening too. What I found out was that a coaxial input has better sound than USB. We compare Khadas to Lindenmann CD1 SE player from 2012. USB source was notebook. FLACs or WAVs were CD Rips of played CDs on Lindenmann. There were three listeneres at room. After the listening we all agreed that ouput from Lindenmann was better. We could define the shortages of khadas very well. So we deciede to play SACD and 24 bit same albs against Lindenmann. The winner was Lindemann. I got idea to try to use Lindenmann as a transport. After listening we all agreed that the khadas sounded better than with USB close to Lindenmann which was still the winner. It´s a pitty we couldnot try any other Coax. transport to confirm our findings. After that experience I decided to try a very good linear power supply for USB input. I know Amir´s measurements. They say no difference. But I prefer listening with It. It sounds better for me close to sound like from COAX input. After ALL It desnot mean that khadas is bad DAC. I enjoy listening it. I must say to Lindemann engineers they made a very good CD player.