How do you know when a stereo sounds good?

When my mind stops wandering as it usually does, and I am captivated by the performance, music, or noticing something wonderful about a composition that I thought I knew well. Presently, I am disappointed with the system that I have, and need to rethink my approach. So yes, I know when I am NOT happy too.

@boxer12 

When a system has the ability to electronically resurrect dead musicians & they are in the room with you.  
 

exactly!

I know my system is good , when I get all the critism  to my stereo, and still loving it.And continues to invite them😀

 This post brings up something I often wonder about. 

Best song title tie in- "What kind of fool..." 

The other question I have is why do you sit down one day

and absolutely love the way your system sounds yet the

next day conclude it is nothing special?

When I dance. Not a good thing.but does prove the stereo is doing its job.