It is true that gold will not corrode like copper. Gold has more resistance, so
you have to use a thicker gauge of solid gold to get the same resistance as
copper. If you take care of copper cables, seal the connections well, clean
them from time to time, etc -- they will not corrode for years and years.
>>My understanding was that gold slightly attenuates the frequency
extremes<<
There is no evidence to support this. The only reason you might
experience attenuation would be that because of the expense, you might use
thin gauged cables and since gold has higher resistance, thinner gauge might
cause you to lose signal across the entire audio band. There are many myths
and wive's tales with regard to cables. There is no hard evidence to support
the idea that silver, copper, and gold sound different from one another
because of a sonic signature due to the material itself. People claim to hear
differences, but when blindfolded, can no longer tell them apart. What does
that tell you? It tells me that these supposed sonic signatures are imaginary.
You look at silver -- it is bright. People claim it sounds bright. It is the mind
at work.
>>The cable I'm using did indeed sound a little rolled-off at both ends
initially, but surprisingly is starting to open up<<
This would be surprising. More likely, it is your imagination. Amazing Randi
has a $1,000,000 offer to anyone who can prove to hear the difference
between a cable that has been "burned in" and one that has not.
There have been no takers. If anyone can hear this difference -- contact
Randi and claim the $1,000,000. But, you have to do it blindfolded.