How do you know when a stereo sounds good?

Me: if a system sound's good, I know it. 

Judge upon asking to define pirnography: I know it when I see it.

Jaco upon asked what music he like's: if it's good, I like it.

Wooden Allen (movie) asked by Psychiatrist if he feel's sex is dirty: Only when done right.

Music is a language of sorts. So when I start grasping the message of the music. In other words, when I am hanging on the expressions of the musicians as if they a reading me an compelling story, it starts to sound good to me. As a person who has messed around with the guitar and heard live music at venues and in person in my or some ones living room, that helps me cull the art from the musicians work. And the better my system does that the better my system sounds. 

dekay, yet another fine humorous post from you. Although ... I wish I could UN-imagine that.

I get home from long and difficult days and the first thing I do is hit the power switch on my amp, make an espresso, sit down and the whole place disappears. That and how many notices I get from the Condo board warning me......