I cannot give a technical explanation, but I definitely have experienced a soundstage. My listening room is untreated, but filled with soft furniture, carpet and drapes. I stream music using McIntosh solid state electronics and Klipsch La Scala speakers. It is not the same with all recordings. Some of the best have been old recordings from the 1950's as well as newly issued material. At its best, the music comes from each side, above and behind me, and the speakers "disappear." I have even experienced a soundstage with headphones. I recall a Tony Scott recording where the clarinet clearly "appeared" from across the room. I speculate that it involves the quality of the recording and the interplay between my ears and brain. The soundstage also expands after listening for a while, which reinforces my speculation that the brain becomes acclimated to the sound, and then produces the soundstage.
Soundstage and image height, does it exist?
On another site, there is a discussion on soundstage, and there are a few people clamming, that, since there is no vertical information encoded on stereo recordings, that soundstage height does not actually exist. It is a product of our minds filling in missing information.
Are they correct?
Please explain your position, with as much technical details as you feel needed.