Benfits of upgraded connectors

A sonic benefit? Depends on the quality of your System.
The AES (Audio Eng. Society) has made the Standards for the ability of signal transfer
100=copper
90.4= Gold
106=Silver
...and so on, there are also some very low numbers available.
Anyway, no matter what you like or hate, Silver can carry 6% more information than any other material.
When you use gold connectors (pure wire or similar) your loss only based on this will be more than 15%.
When we check the materials in most High End units, in general there is very low number material used (=cheap, like mixtures with brass for example, these will be "improved" with Gold plating). Based on this, it is pretty normal, that most users can't hear any difference when they do a "comparison". the reason is found mainly in these inferior parts which are used. When only AES Standard from 60 is used, what do you expect?
A Signal can't be improved, all you can do is to keep it as good as possible.
Is this the secret to get better sound?
Who knows? I think, Yes, but only when done right.

I take no position on sonic differences among rca connectors. However, some technical misconceptions have been expressed above that should be corrected. Resistance in a connection path will only matter if it becomes a significant fraction of the impedance that is being driven. Also, resistance will be proportional to length, and obviously connectors are very short.

The resistance through any pair of connectors making reasonable contact with each other will be a tiny fraction of an ohm. Component input impedances are usually in the range of 10,000 to 200,000 ohms.

If different metals sound different when used in rca connectors on line-level interconnects, it is not because they have different resistances or conductivities.

Regards,
-- Al

Well, I admit I don't know exactly why they sound different. But I do know that I can easily hear the removal of a 4 ohm resister from my crossovers, and removing connectors is an even greater change in clarity and depth although they measure much less than 4 ohms.

You guys must have fussy electrons.