Speaker size and soundstage


Question: for floor standing speakers, how does speaker size affect sound stage, bass response, and the depth of music?

I’m searching for a new speaker, and just tested Dynaudio Contour 30 against Tekton Electrons (16x18 room with cathedral ceiling). Tekton’s are bigger (48 vs 45 high, and 10 vs 8.5 wide, about the same depth) and had a much larger sound stage and greater dynamics and depth. Tekton’s as a rule are much bigger than most other brands, which can be imposing in a room, but the size must equate to a greater sound stage. 
But can a smaller tower be designed to achieve the same sound stage and bass depth of a bigger speaker? If so, what what speakers pull this off?
w123ale
Sensitivity is by definition the response to an input. The lower the sensitivity the more power required for any given input, the less sensitive the speaker. Since the magic of imaging resides in low level fine detail it stands to reason the low sensitivity speaker is other things being equal at a disadvantage. Other things never are equal, but to the extent they are, there you go.

Thank you for taking the time to explain it. The theory makes sense. The old Spica TC-50 comes to mind as a possible exception. I think they had a sensitivity rating of like 83db, but were well known as sound stage titans.

Not mentioning the room at all, just the loudspeakers, in regards to imaging.
Assuming that imaging and soundstage are both married to the degree to which the loudspeaker can recreate the information captured in the recording and editing?

** I cannot identify that the two are not the same, either??**

As I prefer the term spacial information, it is best conveyed when whatever type of speakers used, inject as little distortion and noise into the voicing of the music played. A presentation, that gets the speakers out of the way of the sound produced.
This would include and not limited to, frequency response, cabinet resonances, driver resonances, breakout response of drivers controlled by the crossover, the electrical noise introduced by the crossover, the noise introduced by the drivers and the materials in their composition. In the case of multi driver designs, crossover points, anti-phase and matching drivers that work harmoniously together. One design in particular is considered an imaging and soundstage champion....and it’s not efficient.

Case in point: Electrostatic panels.

According to J. Gordon Holt’s audio glossary, “imaging is the measure of a system’s ability to float stable and specific phantom images, reproducing the original sizes and locations of the instruments across the soundstage.” J. Gordon’s description of “soundstaging” further elaborates the concept, “The accuracy with which a reproducing system conveys audible information about the size, shape, and acoustical characteristics of the original recording space and the placement of the performers within it.”
Source - https://audiophilereview.com/reference-speakers/on-imaging-and-loudspeakers/

And yes I am contradicting something I said earlier in this discussion, that may not have been entirely correct.



It has to do with spacial cues in the recording.  I can get a huge soundstage and imaging (placement) with 2 monitors and 2 subs with the right recording, with others not so much. Room treatment and DSP to control FR, phase and delay will help achieve it more than the size of the speakers. 
2 subs
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Subs can not produce high fidelity, Subs are for HT effects,  useage ONLY, Not for music.
According to some comments it seems that Harry Potter was selling cables to some members of this forum ... I will never cease to be surprised by the capabilities that some people assign to a couple of cables.

Soundstage, breadth, depth? engineers and years of studies to understand and build systems that offer specific characteristics to the sound like those mentioned above (and the interaction with the listening room) but it turns out that all this does not really matter ... you just have to change the cables! Yes baby!!
w123ale, you have to close your eyes when you listen to remove visual ques from the equation. Tektons have a terrible image. Stay away.
There are only two sizes of sound stage, point source and line source. Line source speakers of which there are very few which are truly full range produce a large up front sound stage. Point source speakers, of which there are many produce a smaller "miniature" sound stage. 
You can adjust the situation somewhat with speaker spacing and listening position distance but if you like sitting in the first 10 rows you need to search for a line source speaker or partial line source speaker like Magnapans or any number of ESLs. The only full range line source that I know of on the market right now is the Sound Labs 845 or 945. 
Point source speakers are a dime a dozen, you have to chose your own poison.