Sure, why not?
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I've had great success cryoing various types of interconnects including power cords and in each case after a ***long*** break-in period there was definite improvement. I had a conversation with Alan M. Kafton / audio excellence AZ, INC. and we discussed some items you don't want to cryo.
I'm not sure what kind of electronics are inside of the box, but you might contact Alan with that question.
geoffkait is correct, many major and minor power cord companies might not advertise that theri products are cryogenitically treater (some do) but they are. If the process didn't improve the product, why would they smend the extra expense? Personally, I trust my ears and know what I hear...after a long break-in process.
Short list of audio companies that routinely employ Cryo. By the way, this same question came up twenty years ago. Time flies when you’re having fun.
Snake River Audio
Ice Age Audio
AudioMinor Headphone Cables