Someone hit the nail right on the head a few answers in. If noise is gonna enter any system, it will be on the input side of your system. As a club DJ Audio Video engineer of some 40 years now, I often laugh at the specs quoted by companies. I use high quality RCA cables to connect components to my amplifier which is a Primaluna Dialogue HP Integrated Valve driven amplifier. For the Phone stage I use a Cambridge MM pre-amplifier and my turntable is a brand new Technics SL1200 MK2 fitted with an Ortofon cartridge. To put things in perspective, I turn everything on and with everything at idle, I turn up the amplifier flat out. All I hear is a tiny bit of hiss. Naturally I'm hardly gonna play some vinyl at that level. I can't get much past the 10.o.clock position before it becomes painfully loud. I use 4 gauge high quality speaker cable on all the systems I own and any noise that occurs is never on the output side. If you wanna spend 30 K on speaker cable, it's your wallet, not mine. My CD player is a Pioneer CDJ and sounds wonderful using its on board DAC. Just remember that the shorter any cable you use the better. Cheers.
Speaker Cables? why all the hype for expensive speaker wire?
After listening to many speaker cables, I am listening to basic 14 Gauge, high purity copper speaker wire and find myself shaking my head. Does this basic speaker wire sound better than cables many times the price? I am really starting to ponder that question. I think I am hearing things on my records I never heard before and better balance of sound. What are your thoughts?