I know of two places that have great facilities and have done audio related stuff: Purist Audio and Virtual Dynamics. I think Purist does their stuff at NASA? Virtual Dynamics actually has a Cryo Chamber with computer controlled cooling and warming and use LN2. Cryo treatment really works and has brought great improvements to my system. I did a research project on Cryo treatment of metals in University. The whole field of cryo treatment of metals has only recently caught on. Now they're using it for treating engine parts, guns, golf balls, audio cables and pretty much anything that can benefit from the rearrangement of the metal crystal lattice.