No one claiming stuff like this ever passed a blind-test, no one ever could even tell 256kb/s AAC files and a CD apart. Frequencies you don't hear don't alter the perception of frequencies you hear, that's audiophile mumbo-jambo.
*edit* Also, even higher or lower frequencies are probably not even recorded by a standard studio microphone in the first place, because recording equipment is based on scientific knowledge about acoustics as well.
You are not seeing the FULL picture.
http://www.stereophile.com/features/308mp3cd/index.html
What you are not understanding or hearing is harmonic interaction. Think of this as several out of phase strobe lights together. Now think of thousands of strobe lights which is essentially what you are hearing when you listen to digital files except you are hearing thousands of changes of air pressure.
Your brain is probably not used to hearing and DISCERNING the small differences. But consider this, brains grow new cells when you learn. In other words those of us who listen more intently probably have brains that decipher musical information more discretely.
Personally I can totally hear the difference between a 256 file and a CD. No contest. I don't hear it all the time, in other words just part of the time. I hear it in the imaging harmonics etc.
Listening and comparing short segments of a sound test are not adequate for comparison as the brain cannot remember and compare two segments of sound adequately. In other words if you sat me down and asked me to compare one segment to another I might not remember the first well enough to compare it to the second. This doesn't mean that I don't hear it, in long listening session I do hear it, particularly during certain passages.
I probably listen to different music than you. Everyone listens differently, for example I'm interested in microtonal music so I hear tuning differences more acutely than you do. In fact modern 12 tone music you listen to is "out of tune" but your ear has been trained to hear it in tune. Duke Ellington's trained ear listened to sound differently. Beethoven, who lost his hearing after the 6th symphony didn't hear at all, but he "heard" sound in his brain anyway, and some say "felt" sound through his skull by putting his head against his piano.
Your contention that studio mics don't pick up high and low frequencies is also flawed, depending on the mic. Mics pick up and transmit different frequencies at different rates, the graph isn't flat and it doesn't just abruptly end at either end. Mics also pick up sound from different directions differently, some just sound from the front, other from front and back, others are omni-directional.
In addition much of modern recording is done using synthesizers and software which have nearly unlimited abilities to produce frequencies above and below the threshold of hearing.
So you see your evaluations and others about "what we hear" are not really considering all the factors. Even double blind tests cannot be accurate when we are considering how the brain evaluates sound. One could say that some brains evaluate losslessly while others toss out information they cannot evaluate.
