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

I agree. Just like leaving an amp on 24/7 vs listening right after a cold start-up. You just know when you listen.

In are head" any decent set of ears! listening to a resolving system can hear new cables, resistors, circuit boards, transistors, breaking in'.

Some of the best designers have acknowledged the " breaking in process" and if you think its in our head you need to change hobbies cause your clearly wasting time and funds on this hobby.

Tecknik, interesting point. In fact, I do not know of a high end manufacturer, that states their equipment sounds optimum as soon as you plug it in and start playing music. So many products owners manuals, written by the engineers and designers, talk about the breaking in process. As far as kosst and others, they are measurement people, and go by the " if it can't be measured, it can't be heard ". Just need to ignore them, 'cause they keep coming back. Enjoy ! MrD.

just got some new (for me) Dynaudio monitors...the manual says all their speakers need a few weeks of break-in,,,I think some engineers work there...I know they do measurements...