There is some science and physics behind the break-in of electronics, but it has been taken way too far by people not understanding how minor it is and the reality. You do not need to break-in a component before listening, that's silly. Just plug the damn thing in and enjoy it. You must have the full circuit complete to break-in anything in the system as the circuit needs to be complete. Stop overthinking this, just play it and it will break-in with normal use. Don't expect some magical change.