I'm too tired to listen to your video at the moment, it's late here. For videos, I think you have to be careful - if you're watching the video at the same time as listening to it, then your mind will build sound cues from what you see on the screen, and will be heavily influenced by that, so I think if you're gonna be using Youtube vids to listen to music in terms of assessing the soundstage then you're gonna have to shut your eyes through the whole song.I was referring only to the image and soundstage of the video
I heard an instrument high up behind me to my right in the room did you perceive it?
EDIT: and I'm not sure that you re-listening to the track with your eyes closed will erase that prior perception you had, you'll likely remember where to expect that instrument and your brain might just place it there.
EDIT#2: I think it is possible to perceive that you hear something behind you in 2-channel music. There's a few tracks I can think of where I hear some effects behind me (it's rare), but that happens more clearly & reliably with my speaker setup (but I can't remember if I hear it the same way everytime I listen to the track), to a lesser extent with headphones. I think some of those effects I mention are designed to sound like that, I think they intentionally bake in rough HRTF effects into those effects - either by trial & error on the producers part by sound experimentation or maybe something more sophisticated, I'm guessing.
EDIT#3: to assess soundstage, not only when watching Youtube vids do you need your eyes closed, but even just listening to a track if you don't have your eyes closed then I think it's hard or impossible to visualise the soundstage because having your eyes open will clash with the visual representation of the music space - afterall having your eyes open you're perceiving reality of your environment, but recorded music is a kind of imaginary construct if you will that's unrelated to your physical environment that you find yourself in - therefore to be absorbed into the imaginary construct of the recorded music you have to shut your eyes to remove yourself from your immediate physical environment - that's what I find anyway. (You also can't be moving your head around a lot either, because there's no head tracking process, so that will probably not allow your brain to make sense of any soundstage you hear in the music otherwise.)
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