Quote: Originally Posted by Armaegis /img/forum/go_quote.gif Materials do not necessarily change when cooled to cryo temperatures. Everything hinges on composition and the existing microstructure, as well as any residual stresses and/or deformations. Material phase changes are usually reversible, especially if the temperature changes are made gradually. Changes that are not reversible: - precipitation (ie: of solute alloying elements, carbides, etc) - change in grain size - change in internal stresses (usually) It bugs me a little that there is no presented data, since I have seen some studies that measure a very strong change in thermal and electrical properties of metals after cryo treatment. None of these were done on audio components however. In my educated opinion, I have my doubts as to whether cryo treatments would make an appreciable difference in audio. I can see it making a difference for something like a brass instrument, but for cables I'm doubtful that the change in electrical resistivity would make any difference perceptible by the human ear. However, proof is in the pudding and all that. I'm not sure why there's so much hooplah in cryo post-processing anways. We audio nuts are always expousing "source first". The money would be better spent on wire that went through better manufacturing rather than cryo treating afterwards. With cables it has been proven that when there is a change in measurement it is still irrelevant to how the rest of the system measures. Even the most basic of basic cheap copper that would only measure 99.8% pure would sound the same as 99.999999% pure. Besides the brass horn what other advantages are there for cryo treating that are used in the real world with measureable differences?