Ohm's law is very simple. The Power driving your speaker equals to (Voltage power two) divided by Resistance (speaker plus connecting wire).
Simply put, if your speaker wire adds more resistance to the circuit - it is bad.
Pick a 10-12 gauge speaker wire and you will be absolutely fine.
Measure wire resistance with multi-meter, you will find it equals or very close to zero, even for 100 ft length.
"Oxygen-free copper is best" - nonsense. All copper wires are oxygen free.
"Speaker wire affects sound frequency" - not for an audible frequency range. or twice as wide (10Hz - 40kHz)
"Wire affects signal loss" - It either conducts without loss or not. See resistance above.
"Wire affects sound distortion" - another nonsense.
"Wire affects sound stage" - this is silly. Find a good placement for your speakers based on your room size, geometry and surroundings.
Some wise folks even talk about speed of a sound signal propagation. I do not even want to comment.
If something does not sound nice in your system, no wire will fix it, look at you components (speakers, first of all) instead. Period.
Same with connectors. Either they provide good electical contact or not. Just make sure you connections are not loose. It really does not matter what kind you use, banana plugs, pins, binding posts, or simply screwing bold stripped wire to your speaker terminals.
Gold plated connectors' only advantage is that gold does not oxidize. Otherwise, gold conductivity is 25% lower compared to copper (surprised?).
Now, spend 50 bucks on 100 ft 10-12 gauge speaker wire, plus another 20 on connectors and enjoy.
Or, spend hundreds or even thousands on the "king of wires" and lull yourself how it improved a sound of your system. Amaze your friends.
I have a degree in Electrical Engineering specializing in acoustics, in case.
