There's a huge thread on this. My experience is that the insulative materials' dielectric potentials need burn-in, or "curing", rather than deep-freezing the metal conductors.
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I just installed my first Jena Labs cryo-treated Hubbell 20amp IEC onto my passive in-line power conditioner that connects to my amplifier. The improvements were substantial and surprising.
Of course, now I'm going to have to order more Jena Labs cryo-treated IECs, plugs, and outlets from them.
So why not continue this treatment with cables, ic's, speaker cables, and finally components themselves?
Oohlala, that is a very good question and to be honest I wouldn't have the foggiest.
But I would venture a guess that the Jena Labs' non-cryo-treated 20 amp Hubbell IEC connector would sound quite similar to the replaced non-Jena Labs non-cryo-treated 20amp Hubbell IEC connector that came stock on my Foundation Research LC-2 passive in-line power conditioner.