Placebo effect is negated by blind testing and a lack of variability in the result.
That’s why you get to try before you buy.
I know people who can’t tell the difference between mp3 and FLAC!
Because the difference is extremely minute, tends to only exist in the high treble frequencies, has to be specifically listened for, and finally, generally only really applies to certain songs that the encoders don't respond well to.
You can take a FLAC file, convert it down to MP3, layer the waves on each other and cut out exactly what has been removed from the MP3, then play it back. Yeah, you can probably hear a very tiny something... now put it back in and add in the masking effect that lower frequencies will have and it practically disappears.
Most people can't tell the difference because most people don't care to look for something which doesn't matter. (We are specifically talking 320 here, right?)
The placebo effect is negated by *double-blind testing*. What you have done, from what I can see, was not double blind.
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