<font color='#000000'>I've researched this topic to great lengths by talking with cryo-labs, going to Universities and meeting with Materials Experts, reading Engineering Text Books on Materials, taking many Materials classes during my years as a Mechanical Engineering Student, and looking all over the Internet, and I STILL find NO conclusive evidence or even mention of the fact that cryo-freezing is beneficial to electrical properties of cables.
In fact, the only companies that talk about cryo-freezing cables are a handful of exotic cable manufacturers. Is this a strange coincidence?
The reason why these companies are applying cryo-freezing to cables is because they are implementing something that is valid for stress relief, then distorting the facts, twisting the truth and applying it to electric current. Folks, the two are completely separate and different.
First of all, not all metals are stress relieved at cryogenic temperatures. Copper is one such metal that only has marginal, at best, mechanical benefit from cryo-freezing. Secondly, Cryo-freezing is primarily used as a form of stress relieving certain metallic objects that have gone through an agitated form of fabrication. Other forms of stress relief include heating and annealing, shot blasting or sand blasting, and heating and vibrating. The method selected is dependant on the material and the desired result.
As an example of something that is benefited by stress relieving via cryo-freezing, let’s consider a brass instrument, such as a trumpet or saxophone. Brass instruments are forged into shape and during that process internal stresses in the material develop in areas that have gone through substantial deformation and/or bending. A brass instruments tonal quality is dependant on vibration of the instrument which can be characterized as the sonic resonance of the instrument. The stresses within the material which froms during the forging process slightly alter the instruments sonic resonance, but NOT SIGNIFICANTLY. There can be a marginal improvement to the tonal quality of a brass instrument by stress relieving the instrument either through heat (which can be detrimental to other parts of the instrument) or by cryo-freezing. For example, after a 48-hour cryogenic temperature soak in liquid nitrogen, and a very slow warming process, the sonic resonance of the instrument slightly improves as the stress is partially relieved in localized areas of high stress. As sound is formed during blowing through and vibrating the instrument there can be a very marginal improvement to the tonal qualities of that instrument which may be noted by some with a good ear.
PLEASE, OH PLEASE NOTE: There is NO/ZERO/ZIP/NADA change in the electrical properties of the material. As cables are characterized by resistance, inductance and capacitance (also known as R L C), and there is NO measurable changes to these values, their ability to carry a signal remains unaltered before and after cryo-freezing.
As for proof, ask ANY of the cable companies who perform cryo-treatments on their cables to show you measurements relating to a change in resistance, inductance or capacitance. What you’ll get instead is a total BS story about how it’s not measurable and the benefit is accomplished on a microscopic level by the improvement to the micro structure of the material. Well, since electrons don't give a rip about the micro structure of the material, there is NO validity to these claims. You can stress relieve a cable all you want via cryo-freezing, but the electrons are still going to only react to resistance, inductance and capacitance, not internal stresses and micro structure.
In conclusion, there is NO benefit in cryo-freezing anything by which the performance is based on electrical properties. You can successfully cryo-freeze brass instruments, guitar strings, mechanical parts that you wish to improve the fatigue life on, and other assorted goodies that may benefit from stress relief, but in no way, shape or form, is anything changed electrically, thereby eliminating any possible benefit to cryo-freezing your cables. So save your money and avoid ANY and ALL cable companies who promote such nonsense.</font>