Fair point. I need to explain better, remember I come from speakers more than headphones.

Many amps/speakers I have listened to can lose the front/primary vocal in the imaging/soundstage. The real strong systems do a better job of separating that vocal and placing it in front of everything else, so you get a wide soundstage with the perception of the vocalist being front middle. Obviously the recording has to be done right, but this is one of the things I look for in higher end systems.