WHAT WAS THE BEST SYSTEM YOU EVER HEARD AND WHY WAS IT?

I was at Echo Audio in Portland last summer and it was a slow day (there was a parade that shut down the downtown area).  The owner, Kurt had a pair of  Dan D'Agostino Momentum M400 monoblocks set up with a  Pro-Ject Xtension 10 as the source going through a Modwright PH 150 and I think KEF Reference 5 speakers. 

Their listening room is not acoustically treated, there are some hard walls and open spaces. 

Kurt put on Roger Waters' Amused to Death and the first song, The Ballad of Bill Hubbard has a dog barking in the distance.  I was shocked when I heard the dog's bark coming from beside me.  I could also clearly hear the voice over in the background, the tale of a soldier trying to rescue his buddy Bill during the war.  When Jeff Beck's guitar made it's entrance it was incredibly dynamic and detailed without any hint of grain.  I was amazed at the size of the sound stage and the detail and dynamics.  It was a sublime few minutes that I recall vividly.  

@aolmrd1241 thanks for the link, I wasn't aware of that.  We were listening to vinyl, but I assume the playback media doesn't matter since the effect was produced by the recording technology.  I bought the vinyl afterwards as well as the CD/Bluray combo after that listening session. I did get a lot of that 3D effect in my own system, but not as enveloping.

@calvinj I told Kurt I was pissed at him for letting me hear that system because I was going to go home and be unhappy with my system. Thankfully, that wasn’t the case :)