I’m not a believer in cable break in. However, cables absolutely can and do make a difference in a system. Thin cheap wire like those found in Hosa/Rean Silver/standard dollar store cables is pure garbage... internally, ultra thin low purity copper mixed with lousy dielectrics and poor shielding. Bad in any environment.
However...
The electrical properties of wire, whether inside audio equipment or interconnects/power cables do not change.
I think we all know who talks about...
Quantum Tunneling process to enhance audio performance by altering the molecular structure of cables and components, improving signal flow and reducing noise.
But the molecular structure was DEFINED when the cable was built in the factory, or when it was custom-built by hand.
For example, 7N copper, PCOCC copper, LC-OFC copper, and even pure silver wire do not change their state like capacitors, resistors, and other passive components inside audio equipment, which are complex machines.
In addition, there is no documented proof that cable burn in even exists. It is a speculatory reaction rooted in cognitive bias. Hours have past... you’re enjoying your system, and even more now after days, weeks, or even 30 minutes following a cable swap. So of course you will hear a difference. Truth is, the cables didn’t change at the quantum level or the molecular level. Else they wouldn’t have been operable to begin with if to reach their "optimal" state they needed time. You’d be getting partial audio output, not clear and consistent audio output.
Audio dealers and cable manufacturers have you believe in the cable burn in fantasy, so you pass the warranty timeline and can’t return the cables for a refund.
And herein lies another problem... Let’s suppose an audiophile goes on a long vacation. The system is left for a month in the house, nobody is even powering the system on.
Then upon return, does the audiophile need to spend hundreds of hours burning in the cables again?

