I feel like your understanding of how we perceive sound is wrong, but I have neither the knowledge nor time necessary to argue with you. All I can tell you is that a speaker and IEM with matched frequency response sound completely different. I'm sure you'd agree that I'd be able to accurately tell you for any item I have never heard if it is a speaker, headphone or IEM, no matter how you EQ it as well. I see sound in shapes and colours and it is just completely different things.