I was really surprised at how great the audio quality is with the X1. I have attached to it my 8TB hard drive that has all my recorded music. i.e. CD's, LP's, etc. on it via a USB cable. I also have the X1 attached via a fiber cable which I thought was also a big improvement over ethernet, etc.
With the X1 and Qoboz I no longer listen to my 6000+ CD's it has been that great.
Making the X2 to sound even better than the X1 will be a real challenge.
ozzy

