joejoe
OK Geoffkait I’ll bite, what’s the reason?
Let us call it mind-matter interaction. You could also call it extra sensory perception. The subconscious mind picks up on but misinterprets it’s surroundings, especially the immediate surroundings, and shuts down (degrades) the perception of sound as a response. Of course you’ve been accustomed to it your whole life so you take it for granted. You cannot control it because it’s subconscious. That’s it in a nutshell. That’s why, after the best laid plans have been implemented - the best electronics, the best cables, the best room treatments, the system still sounds edgy and shrill and distorted, especially in the treble. Especially when played at moderately high or high volume.