Speaker size and soundstage

Since the audio comes out of the speakers, many seem to think they control everything

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Some of us here do believe Spaekers reign as The Kings in our system,. Power = power. 
cd player = DAC
Phone gets a tad edge vs CDP, Not much. 
Speakers rule
 The Crown Jewels

I have a  4 inch clone on the Lowther/Fostex design. 
Its ok, nothing great, at a  miserable 91db. I us it for low mids-low highs,  
Although a  tiny 4 inch cone, this lil driver puts out huge massive soundstage that will blow you away in near field/small room acoustics. .
 = Size does not matter, 
db sensitivity is all that matters, 
db sens is the Holy Grail in speaker design. 
This lil fullrange will match the masssive 300 lb Wilson speakers in midrange soundstage. 
Size is not materail, Efficiency is all that matters. In mids/highs, Bass is different. 

In general the bigger the speakers the bigger the soundstage.  There are a few exceptions just like everything else in life.  

One of these is not like the others:

"The soundstage starts a few feet behind the speakers, and extends well out into the room, seemingly surrounding you. I've never (in a true two speaker setup) felt so enveloped by the music as I was last night."

"The imaging was so good that I felt like the vocalist was performing right in front of me and that I could reach out and touch them."

"so far above any system I had heard ...because of the detailed soundstage."

"They certainly did not image well when I heard them and I do not think you can get them beyond what I would call standard imaging."

Wonder why?

Mahgister, I did not miss that fact at all. I went out of my way to explain it.
The mastering engineer can mix any sound/instrument recorded in only three ways all the volume in the right speaker, all the volume in the left speaker then anywhere in between. Unless he resorts to staggering phase and other tricks the sound is going to come from the right speaker, the left speaker and anywhere in between. If an instrument images outside of the stereo pair it might sound cool but there is an acoustical problem with the room. This is the only way that can happen under normal circumstances. Forget about how the recording was made although it is nice to get the acoustic ques of the venue into the recording it is because of their low levels that reflections can compete with them and make it seem as if you are in that venue but the high level of the instruments themselves should always come at or between the speakers. There is no other way to mix them without tricks. This is not IMHO Magister is a matter of fact. 

Well, I’m no expert, but can only report what I recently heard. I listened to three levels of Focals: Aria, Kanta, and Sopra at a dealer with all the same electronics.

While there are other differences of course in design, they all are from the same manufacturer, and all step up incrementally in size.

All very good speakers, but without question the sound stage increased by big steps. For me at least, there is a threshold for speakers where they disappear and I am just immersed in the music. So far in my limited experience, the bigger the speakers, the more they “disappear”. Interesting, on my second visit to the listing room, the Sopras were so much smaller than I had remembered because they through such a massive enveloping sound that in mind they had to be huge, but weren’t. 
When I returned home, I listened to my Electons. They completely fill the room like the Kanta, are less detailed and smoother, and a bit darker. Mind you I have a hybrid amp and my vintage tubes are definitely smoothing the sound. 
As an aside I recently added a x10 Paradigm sub to my Electrons and it really improved the overall depth of the music and my engagement.