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If you pee on the third rail in the NYC subway..will it kill you? This is one of the more daring pissing contests.
Yes, this happens whenever there's no audible difference but people think there is. This is the "next frontier" in audio research - understanding why people think they hear a change even when none could possibly exist. ...
I disagree. No "...change could possibly exist...? In other words, a change is impossible. Impossible is a loaded word. Is it not true that in order to claim that a change is impossible, 100% pure unadulterated subject knowledge is required? "Impossible" is only correct to the extent that the observer's knowledge is perfect & encompasses anything & everything that there is to know about the subject. Impossible requires complete, perfect, pure, & unalterated sensory awareness. Impossible implies absol ...
...This is the "next frontier" in audio research - understanding why people think they hear a change even when none could possibly exist. ...
doesn't the topic "who can piss farther" usually end up in a pissing contest?
Well, okay, but let's look at this from a practical perspective starting with frequency response. If the response of a device measures flat within 0.01 dB between 10 Hz and 50 KHz, I'm confident proclaiming that nobody can possibly hear the deviation. All it takes is a few minutes playing around with a good digital equalizer to determine that a change of 0.01 dB is inaudible.
Likewise for distortion. This is usually expressed as a percentage of the total signal, but distortion can also be expressed as being some number of dB below the signal. So let's say a device has total THD + IM at 0.01 percent. That equates to the sum of all distortion components being 80 dB below the music or speech. Each individual component will be even softer. I'm not sure anyone could hear something 80 dB below the music even if the music stops. But distortion is present only while the sound is playing, so the music masks the distortion. Again, a few minutes with a decent audio editor program will prove this is the case.Related to the audibility of distortion, IM distortion can have substantial harmonic energy farther away from the original sound than THD, which reduces the masking effect. That is, when playing a 9 KHz and 10 KHz tone at the same time, the 1 KHz IM result is more audible because the 9 and 10 KHz tones are so far away in frequency. While this is true in theory, if you try it (as I have) in a DAW program, you'll find that at 80 dB down you still can't hear the 1 KHz component.