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.

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