I recently read an article in a Hi-Fi magazine advocating that enthusiasts should run in or break in their new cables for hours using pink noise or such like. This idea is implausible. The magazine offered no "before and after " measurements to help prove their assertion. Also they did not publish the results of double blind listening tests probably because they did not do any. Not only do they suggest that an audio enthusiast should spend hundreds of pounds per metre for cables that do not perform any better than standard cables costing tens of pounds, they also try to fool you that running the cable in will improve the sound when it will not.
I have never heard a difference in any Hi-Fi equipment after playing it for many hours not even in electro-mechanical devices such as turntables and speakers.
I can only think that the idea of running in Hi-Fi equipment came from the era of valve amplifiers. When you first switched on a 1950s radio or amplifier you heard nothing because you had to wait for the valves to warm up before they worked. After they had warmed up no improvement in audio efficiency was discernible.
Running in cables is just another myth and a case of the "Kings New Clothes".
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