You asked for it...
1) Can you explain what sound linearity is? I'm not really sure what you mean by that.
2) About the sound stage... what is the desirable height/width, and what do you listen for to tell those things? Or is that something that I'd have to hear a good setup to have explained properly?
3) Listening position: what is this judged on? Where it sounds the best? The range of places it still scores well? Something else?
and finally 4) Installation integrity: what does this mean?