Who says cables don't make a difference?

After a power cord delivers the needed Amp and required voltage to the PS of an amplifier it had no effect on the sound . Filtering your line in an urban area may be.

Mocassin2,
When one thinks about what comes before and after The “boutique” power cord: miles of cable before the mains plug including the house wiring and circuit breakers, and a tiny fuse filament and 18 - 20 gauge wire before and after the fuse to the primary of the power transformer through the power switch, it’s difficult to understand what a 1.5 - 2 meter length of cable, the thickness of a baby’s arm (or, perhaps, leg) is supposed to be doing.
But I am a firm believer in isolating one’s audio system from the mains supply. I use a hospital 30 Ampere isolation transformer with LRC filters on both the primary and the secondary windings. Looking at the mains coming out the wall with one channel of a dual channel oscilloscope, and the secondary of the transformer with the other channel, the difference in the interference noise before and after the transformer has to be seen to be believed. The difference in sound with and without the hospital supply is anything but subtle.

Cables, Capacitors, Diodes, Solder ... it all has a sound. Can we hear it in our room? Can we justify the expense?  Maybe, maybe not. 

It's no matter ... the main listening tool is ME.  Upgrade yourself first and always.
There are a lot of people who don’t trust their ears, and they will preach the gospel of their ways to make you believe their faith. They call themselves scientists.  Science is how sound moves on a wire, it’s not how we judge that wire for sound.

"Wire is like a condom. If it works, everything is fine. If not ..." Herb Reichert from an issue of Listener. Sane advice!

6k ic's ? I could be a millonair and wouldn't spend that kind of money on a piece of wire . Not that I don't believe a I c could make a difference . They can and they do , in some instances a dramatic difference . But to spend that amount on a wire ? Especially knowing that some testing and shopping around could get me close or even surpass the sound . Even if it were the best...no way . XLO , JPS Labs , Nordost , Purist , Transparent , MIT...they all.make excellent wires that comunicate the essence of the music without spending so much .