Ethernet cables

Ditto the first answer.

Triode Wire Labs freedom. I have two, one from extender to optical isolation and a very short one from switch to streamer. It gets complicated but it all makes significant improvements.

Everything matters.  A While back, Jay of Jays Audio Lab said to save the Either net cables for last because they made the least amount of difference.

Take it with however much salt you wish.

No, no it's not worth it. Ones and zeroes don't know nor care how they travel and all the stupidly expensive cables absolutely will not change that.

+2, @ghdprentice …well said!

It is much easier to discern differences between cables in a well appointed system. 

No, no it's not worth it. Ones and zeroes don't know nor care how they travel and all the stupidly expensive cables absolutely will not change that.

And here they are.  Well, it was a good thread while it lasted.