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RE: the point is

> we can hear that same distortion, right into the noise floor where instruments have trouble measuring it.

That is total absurdity! It is not possible to hear anything into the noise floor. In fact, if you can't measure it, you definitely can't hear it. It's not possible to hear anything that can't be measured.

The reason this absurdity came about is because of the way the noise floor is measured in vinyl and analog tape. You can see the noise floor in the spectrum graph below. It measures only -50-dB at 30-Hz and -90-db at 4000-Hz. However, when you measure it with a broadband meter you get a noise floor of only -50-dB because the meter measures the highest noise level.

Therefore, a weighted measurement system was develop to more accurately describe the noise floor with a single number somewhere in-between -50-dB and -90-dB; let's say that number is -70-dB, which is still well above the actual noise floor in the higher frequencies. Now, it's possible to detect signals below -70-dB so people incorrectly believe you can hear signals below the noise floor. However, this is a fallacy. It is not possible to hear anything below the true noise floor; furthermore, anything that can be heard can easily be measured. If you can't measure it, you definitely can't hear it!





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