It means that part of the depth that we perceive can be an illusion of our mind. But it doesn't mean all is that. A speaker with very wide dispersion in the highs will also typically add more depth to the sound. A dipole might also because of its dispersion pattern. So it's all an illusion, it's a mixture.Then what is the meaning of: "When we see a great distance behind the speakers, our brain pereceives it as depth and adds it. And it's also gone when you close your eyes"?
When it comes to what our brain interprets by seeing a lot of distance and perceiving this as depth, one can easily test this by listening with eyes open vs closed. Many have done this and experienced what I'm saying.
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