Beware of the cable claiming long burn in period.

Try using cables from reputable manufacturers who have a history in the industry. If you don't like the cable, the sell it on Audiogon, eBay or US Audio Mart. Try buying your equipment and cables/accessories from a reputable local dealer with a showroom. They can switch in and out for you so you can tell the difference.  Nothing to do with which equipment it is. This isn't speakers and room interaction, it's getting information from source to pre-amp. And if you have the ability to Exchange (no one should give you anything but store credit as they then have an open box product they will lose money on) then respect the terms.  You don't need to listen to anything while breaking in.  Turn your volume to zero or mute and run 24x7 for at least a week. You can, of course, listen as time permits.  Keep sending signal through the cable.  If you hit the end of the exchange policy and don't like it before it expires, call your dealer and tell them you'll be in to make the exchange. And just because a manufacturer espouses their virtues doesn't necessarily mean YOU will agree. But again, buying without auditioning is the risk you take. And if the manufacturer is selling direct means they have little credibility. They aren't using a manufacturing facility with QA process and controlling tolerances. And this is why there is a robust secondary market. The blind chasing a shiny object. So be it.