You are sonicaly in pursuit of the "EARGASM" and like all other 'gasms' it is totally a personal and internal even. Think of it as a light hallucination of joy that usually brings forth pleasant memories, or something that. Beyond this there are no other criteria because only you - are you.
How do you know when a stereo sounds good?
When do you know your system is pleasing to listen to? How do you conclusively prove to yourself that your system sounds good to you? How do you determine that you enjoy listening to music through your stereo? Do you have a suite of measurements that removes all shadow of a doubt that you are getting good sound, sound that you enjoy? Please share.