What is the top of the line metal to use for connectors and cable? I don't think many people use pure gold or know how that sounds compare to pure silver and pure copper. It seems to be down to pure silver costing more than pure copper. Do cable manufacturers then use a small coating in microns of gold or silver to prevent oxidation?
Do these metals sound different whether it be used in the digital side as in source and digital side of the dac or analog side of the dac, headphone ampifier, and headphones? Whether it be used in the AC side or DC side?
Hard questions to answer in some ways.
Gold cables are very round sounding with great detail and extremely smooth frequency response IME (which is VERY limited... $$$$$$ Check these out:
http://www.koolcables.com/silkworm+/index.htmlSilver CAN be a bit bright in some systems depending on the purity of the silver, finish and most of all the materials processing the silver has undergone. Silver has tremendous detail with a wide bandwidth. It can be the best choice for many systems in properly matched to the gear. Gsuge is extremely critical in the "harshness" context.
Copper (OFHC or 6-nines) copper is the goto for 90% of the systems in use. Sounds very smooth and balanced when properly terminated and sized for the gear.
Sizing: bigger is seldom better for line level applications. There is an optimum gauge for each application.
Finish: proper surface finish is essential to any wire used as an interconnect.
Dielectrics: Every dielectric has its' own sonic character and signature.
Termination is the most important aspect of cable construction after conductor geometry.
Plated wires are a bad idea under most circumstances for optimum sound. Silver plated copper is something that I NEVER use. It sounds "broken" when it comes to bandwidth clarity and image integrity never quite snapping into focus.
There is a alot more and what has been written on cable construction would fill books. I've hit most of the high spots, but not all.
The answer to your last paragraph is easy: Yes.
As always in audio - YMMV.
Dave