I hear the most difference in headphone cables. I have also constructed my own USB cables using a higher quality, larger awg wires than many of the imports but that is hardly comparing apples to apples.
![KSC75 Smile :ksc75smile: :ksc75smile:](https://cdn.head-fi.org/e/headfi/ksc75smile.gif)
I wish I could say I heard a lot of difference in interconnects but I tend to use quality Mogami, Belden, and Canare cable so I am starting with something very well made. I have had one person who could consistently tell the difference in wire types but she is the only one I know who could do that and many have tried that test with me.