How Do Amps Affect Soundstage?

The fact that there is no clear cut solution to matching an amp and speaker conundrum you can just skip the entire mess...just buy active speakers. The speaker designer can match the drivers to the amp, use an active crossover, and provide a tailored solution for that price point.

Thanks all.  Mike Lathat vigne's response is most interesting.  The recent comparison that brought this to light for me was swapping my ARC Ref75se for a First Watt F7, running into Harbeth 40.2.  (To be sure, I am talking about a decrease in the soundstage that WAS THERE in the source and system before just changing the amp). Technically the F7 (25-35W) is underpowered for the 86db sensitivity Harbeth's, but I was thinking no big deal - my ARC amp was rarely drawing more than 10-15W for the volumes I need.  I am not a bass maniac and am satisfied so long as long as the bass is not muddy (the F7 seemed to have plenty of bass control).  But perhaps the undergunning nature of the F7 affected SQ in other ways.

So many SS amps focus on 300 watts and don't give enough attention to the first watt.  A good SS amp will have a good soundstage, but don't assume all $5k ss amps do.

One amp I have verified and like it a lot because it mimics a tube amp is Kinki Studio Ex-M1+.   It is chinese but has been said to have a Swiss sound.

100 wpc.  It is an integrated.

Jerry

The soundstage is there. Some combinations of Amp + Speakers get in the way - some do not. 

@zazouswing exactly the way to look at it.  All the goodness is in the recording and the question is, can your system reproduce it without degrading it.  A system doesn't add anything (good).

Jerry