The fascinating thing is that you are alleging that anyone who tries this unit and hears a difference, is positively biased and imagining it.
Anyone? No. I am not there to vouch for that. Maybe they changed the volume, or something else and did hear a difference.
I am here to say if we change one loudspeaker for another, we can all be sure that differences reported are valid. At the other extreme are devices like this. These are the realities of the situation. I didn't make them that way. I am reporting them as such
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But by looking at this unit, making up your mind as to what it does and doesn't do (within the confindes of your knwledge which can't be all encompassing) you are making it impossible for yourself to have any experience that contradicts your opinion.
I haven't made up my mind. I am expressing what I can tell from analyzing it; you all are telling what you can tell from hearing it. Two different approaches bringing data to the table.
My question for you is this: if I brought my water hose inside and hooked it up to my system and it sounded better to me, what then?
Instead of having a experience and letting that inform your opinion aswell as what you know.
PS: If it does turn out that your knowledge includes, understanding the underlining cause of every single physical phenomenon then you have my deepest respect indeed.....
My doctor can examine me and tell me I have an infection in my throat without experiencing it himself. He could be wrong but years of experience says he is more right than I would be examining a patient. Same here. I am bringing knowledge of electronics and can line up as many designers as you like to vouch for the same. Indeed for every person that says this sound better, I can get you two engineers who would say that is not possible. I don't understand any conclusion that ignores what I just said.