Cryogenic experience wanted. Constructive please

I don't think paper, pulp, hemp and the like are good candidates for cyro treatment. I could be wrong but from what I've read, metal benefits from it greatly as NASA, the DOD and scores of universities have found out.

I just read that the procedure lessens the repulsion side and strengthens the attraction side of the equation: a changing of their natural nature. It's a good thing for metal since the crystal nature of metal with a greater attraction will hold together tighter, allowing a freer flow of electromagnetic waves. This tightness lessens the "Josephine's Junctions" which interrupt that flow.

I don't think one would want these properties applied to a speaker cone designed to move in and out, get looser from break in, and achieving a final state of elastic play.

I just read this and may be all wet on the matter but it's food for thought. Others here who know more will eventually offer more authoritative advice.

All the best,
Nonoise

There are variables such as time to reach cryo temp, length of time at cryo temp, actual cryo temp and time to return to ambient temp. I believe these variables can affect the end result.

I would seek info from someone who is knowledgeable and experienced with the process because I think it's more complicated than just randomly putting something into "cryo".

It's actually Josephens or Josephons Junctions. Sorry about the gender.

All the best,
Nonoise

"A Josephson junction is made by sandwiching a thin layer of a nonsuperconducting material between two layers of superconducting material. The devices are named after Brian Josephson, who predicted in 1962 that pairs of superconducting electrons could "tunnel" right through the nonsuperconducting barrier from one superconductor to another. He also predicted the exact form of the current and voltage relations for the junction. Experimental work proved that he was right, and Josephson was awarded the 1973 Nobel Prize in Physics for his work."

This is not to say the molecular structure of metals is not changed during cryo, including the transformation of some trace elements to more benign ones and making more homogeneous metals that have been rolled, drawn, bent or hammered, such as musical instruments or wire. For non-audio apps this can result in golf clubs that hit the ball farther, rifles that shoot more accurately, engine parts that last longer, etc.

The typical 24 hour cryo process seems to work well for audio items, which are placed into the cryo cooler along with non-audio items like gun barrels, golf clubs, engine parts, or whatever. I suspect the typical cryo treatment at a cryo lab comprises 10 hour ramp down, 4 hour dwell and 10 hour ramp up. These times could vary depending on size and density of the items being cryo'd. CDs for example reach cryo temps much faster than say a trransformer or gun barrel or French horn.

I would be remiss if I didn't mention freezing audio items in the home freezer, which is also an irreversible process and provides very good results without all the issues related to shipping costs, down time, or temperature shock resulting from cryo temperatures. Cables and CDs, LPs, tubes, even CD players can be frozen overnight then slow thawed in the main refrigerator section for 4 hours or so. Voila!

If you try freezing CDs at home here's a little tip. After freezing and thawing the CDs wipe the data surface with a clean cloth or soft tissue as the freezing process, like the cryo process, drives a little residual mold release compound to the surface of the disc. Use the breathe test to make sure the CD surface is clean before playing.