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I'm a grad student in a lab that makes the world's most sensitive low-noise microwave amplifier (the Josephson bifurcation amplifier.) The cables we use for characterizing these quite literally quantum limited amplifiers are far cheaper than these. Furthermore, I really don't care what you do, cables are symmetric devices, and that label on it is completely meaningless. We're on tens of millions of dollars of grant money, and if we could get more efficient readout by buying better cables, we'd do it. I promise your ears aren't as sensitive as our instrumentation. We also don't "break in" our cables. The Joule heating for a copper wire that carries signal is, I promise, negligible, and not nearly enough to change the crystal structure of the metal.