The improvement may be caused by simply removing and replacing the cables. I found this to be very effective - I assume it cleans something off the connections which builds up slowly over time and gradually degrades the sound without your noticing.
It seems unlikely that freezing them would make much difference, but I've heard other tweeks that I didn't think would work work. Many cables probably get frozen brand new in box in transport to the store, if they are shipped during the winter.
It seems unlikely that freezing them would make much difference, but I've heard other tweeks that I didn't think would work work. Many cables probably get frozen brand new in box in transport to the store, if they are shipped during the winter.