why do expensive amplifiers produce a better soundstage

@yamaho soundstage is the result of at least : left right matching, phase accuracy, dynamics… just like everything else Audio, the diminishing returns principle applies

i've been using Allnic Audio w upgraded tubes and Shunyata Theta NR for the last five years, nothing so far has touched it.  Simple circuit.  

It is a physiological response to wallet depletion.

In my experience, different DAC's made for better soundstage.  And later, on a particular DAC, upgrading the capacitors in the signal path to films increased the clarity and soundstage / imaging.

I'd say if you changed ower amps and noticed better soundstage, then the input stage of said amplifier was just better.

@lanx0003 

"Share it. This is what the forum is all about.  Maybe you could give AI and everyone here a good lessen what actual soundstage should feel like."

I was simply commenting if the OP had listened to multiple examples at various price points over time, he’d find inexpensive amps and integrateds that image extremely well. I’ve had all kinds of integrated amps HH Scott, Jolida, Rega, McIntosh and currently, Luxman, Icon Audio, Naim and just arrived today an inexpensive Rotel a8 that I can’t wait to set up with an inexpensive SUT I bought to use with it’s phono stage and the other great source components I have listed in my profile. I also have two rather nice sets of speakers to try with it in addition to my main ones I use with my tube amps (profile). 

I think I can say I put my money where my mouth is as you infer. So, what’s your experience?

@emergingsoul 

I am among those who have changed system components and room acoustics and noticed improved imaging with the same recordings.