I am familiar with one single product that is completely immune to the source, and that is the Empirical Audio Synchro Mesh. I have put countless digital sources in front of this product, and they all sound equally good using the Synchro Mesh after each and every one of them.
I am not saying it is the absolute best digital source I have heard, but it gets pretty damn close using anything you want in front of it. That is a stunning achievement in my book.
I am not saying it is the absolute best digital source I have heard, but it gets pretty damn close using anything you want in front of it. That is a stunning achievement in my book.