Best Conductor Materials by Frequency

IMO, it only makes sense if you are "tri-amping", otherwise an audio cable carries EVERY frequency 0 to over 20KHz. And even with tri-amping (say with a Linn system), I kinda doubt too many 'philes would have different metal IC's for each band....

"Copper is best from 1 to 1,000 Hz
Gold is best from 700 to 1,800 Hz
Silver is best from 1,500 to 14,000 Hz
Rubidium 4 Micron on silver best from 10,000 to 100,000 Hz"

Seems like you have two different "bests" from 700-1000, from 1500 to 1800, and from 10,000 to 14,000. Makes me wonder about the accuracy of this info...

With regard to normal(not freq. dependent) conductivity: Without getting too technical(for simplicity's sake) call the best metal conductor, silver, 100% conductive. Copper(2nd best) comes in only about 5% less conductive, while gold is 25% less conductive(than silver and just ahead of aluminum). A combination of conductors(outside of silver/copper) would create more problems than it solved. What Elizabeth is referring to is called "skin effect". The higher freqs travel toward the outside or skin of the conductor(causing a higher resistance than the lower freqs toward the center), with freq abberations and time/phase smear results. That's why Litz type wire has become popular in audio. Lots of smaller conductors(individually insulated), that allow all the freqs contained in the signal to arrive at the end of the wire coherently and intact. The Litz solution has been applied for years from tonearm wiring to speaker cables(and, of course, there are the unbelievers). I fully agree that the "results" of that "study" are suspect. The effect of the Rubidium would only be be appreciated by your local bats or Early Warning Radar System anyway. A bit more info on skin effect: (http://en.wikipedia.org/wiki/Skin_effect)

Make that, "aberrations".