Hi Rgs92, I have found the same thing -- the CDSA being VERY sensitive to cables. I agree -- power cables -- and ICs as well. As I mentioned, I have not done the X upgrade but I have completely eliminated the harshness in the highs with my cabling. The highs are so much sweeter now. And the bass is much tighter and better defined -- not muddy at all. The improvement in the sound stage was also quite dramatic -- width, depth and height. I really cannot overstate the improvements. They have far exceeded my expectations.