I think , please educate me if i am wrong, phases (invert or non-invert) are not responsible for the size of soundstage.
The soundstage of a recording depends on how that particular recording was made (recorded, mixed, processed and mastered) and reproduced (what your system are capable of, how well you set up your speakers in your room and the acoustic character of your listening room...etc).
As along as your speakers are in-phase with each other (either inverting or non-inverting), then the soundstage only depends on the forementioned conditions.
If the speakers are out-of-phase with each other, then the soundstage, imaging are screwed up, diffused and impossible to locate the musicians within that acoustic space. This maybe responsible for the illusion of bigger soundstage.
Back to your experience, I believe that my Mobile Fidelity LP "Companion" by Patricia Barber was produced out-of-phase (also experienced by some other listeners ). When it is played , everything fused together in a very strange way.
The soundstage of a recording depends on how that particular recording was made (recorded, mixed, processed and mastered) and reproduced (what your system are capable of, how well you set up your speakers in your room and the acoustic character of your listening room...etc).
As along as your speakers are in-phase with each other (either inverting or non-inverting), then the soundstage only depends on the forementioned conditions.
If the speakers are out-of-phase with each other, then the soundstage, imaging are screwed up, diffused and impossible to locate the musicians within that acoustic space. This maybe responsible for the illusion of bigger soundstage.
Back to your experience, I believe that my Mobile Fidelity LP "Companion" by Patricia Barber was produced out-of-phase (also experienced by some other listeners ). When it is played , everything fused together in a very strange way.