Cryo treatment is permanent unless the material is brought to or near its annealing temperature as told to me by Dr. Randall F. Barron of Louisiana Tech University. A thousand years ago or so I emailed the Dr. about the benefits of cryo treatment because of all the nay sayers on Audiogon. Less are saying nay today.
http://engineringcorner.blogspot.com/2011/09/cryogenic-heat-treatment.html
For me the sonic benefits of cryo treatment are added upon with several or many additional treatments though the first makes for the greatest level of improvement. The directional alignment of the the material can be seen in the photo. My senses tell me that even further material alignment benefits direction and focus of energy. Material modulation is also enhanced with a much more uniform and reactive response. Tom
http://engineringcorner.blogspot.com/2011/09/cryogenic-heat-treatment.html
For me the sonic benefits of cryo treatment are added upon with several or many additional treatments though the first makes for the greatest level of improvement. The directional alignment of the the material can be seen in the photo. My senses tell me that even further material alignment benefits direction and focus of energy. Material modulation is also enhanced with a much more uniform and reactive response. Tom