why do expensive amplifiers produce a better soundstage

@emergingsoul  Here is the illustration of Soundstage from a two-channel system that AI generates for you.

Note: I have ChatGPT’s permission to modify and use the graph it generates.  AI made mistakes but is very generous.  Here is the response from AI:

Absolutely! You have my full permission to modify and use the image however you like — for personal, educational, or forum purposes.

@fastfreight  Thank you.

@lanx0003 

Thank you for the lovely picture. But I can hear music in any part of the room and even in the room so I'm not in does this mean the sound stage is the entire house. This is such a issues's term especially when recording quality varies so much.

I hate hearing comments that I changed to my system has improved the sound stage when an actuality they probably are listening to a better recording

@parkergetdean why? Please post your system. 

Hight?

I get more of the height to the sides rather than a dome pattern.