How much does volume matter when breaking in amps and cables?

The XLO Test CD with burn in track suggests playing the system loud and continuously for a week or two. Use blankets or jeans over speakers to mute the sound. Otherwise, you know....🤪

He's asking about electronics and cables not speakers....

As long as we’re on the subject.... If one is breaking in a power amp, is it necessary to connect it to speakers, or could you get by with just running a signal into it? And if the amp has both XLR and RCA inputs, would it be necessary (or even helpful) to use the same input during the break-in process that one intended to use after break-in? (I ask because it would be convenient to break in my new power amp in a secondary system that doesn’t have balanced connections, while I continue to use my old amp in my main system.)