Why Do So Many Audiophiles Reject Blind Testing Of Audio Components?
Because it was scientifically proven to be useless more than 60 years ago.
A speech scientist by the name of Irwin Pollack have conducted an experiment in the early 1950s. In a blind ABX listening test, he asked people to distinguish minimal pairs of consonants (like “r” and “l”, or “t” and “p”).
He found out that listeners had no problem telling these consonants apart when they were played back immediately one after the other. But as he increased the pause between the playbacks, the listener’s ability to distinguish between them diminished. Once the time separating the sounds exceeded 10-15 milliseconds (approximately 1/100th of a second), people had a really hard time telling obviously different sounds apart. Their answers became statistically no better than a random guess.
If you are interested in the science of these things, here’s a nice summary:
Categorical and noncategorical modes of speech perception along the voicing continuum
Since then, the experiment was repeated many times (last major update in 2000, Reliability of a dichotic consonant-vowel pairs task using an ABX procedure.)
So reliably recognizing the difference between similar sounds in an ABX environment is impossible. 15ms playback gap, and the listener’s guess becomes no better than random. This happens because humans don't have any meaningful waveform memory. We cannot exactly recall the sound itself, and rely on various mental models for comparison. It takes time and effort to develop these models, thus making us really bad at playing "spot the sonic difference right now and here" game.
Also, please note that the experimenters were using the sounds of speech. Human ears have significantly better resolution and discrimination in the speech spectrum. If a comparison method is not working well with speech, it would not work at all with music.
So the “double blind testing” crowd is worshiping an ABX protocol that was scientifically proven more than 60 years ago to be completely unsuitable for telling similar sounds apart. And they insist all the other methods are “unscientific.”
The irony seems to be lost on them.
Why do so many audiophiles reject blind testing of audio components? - QuoraDid you even read what you posted. Here let me help! In addition, the discussion emphasizes the usefulness of the ABX approach for testing clinical populations. The results are interpreted as providing evidence for separate auditory and phonetic levels of discrimination in speech perception. The obtained one- and two-step functions for both ABX and 4IAX tests are consistently better than the predicted discrimination functions, although the form of the obtained and predicted functions do match each other reasonably well. The testing had absolutely nothing to do with blind testing by the way. ABX is just one of many test procedures used. Preference testing, pair testing, triads, etc. Guess what, our brain can only detect timing differences out to 0.5 milliseconds. Does that means that we can’t discriminate audio signals longer than 0.5 milliseconds? If you don’t understand what you are reading then it is best not to comment with authority. I don’t ask my mechanics to interpret my x-rays for a reason! Here let me illustrate how flawed your logic is. Audiophiles regularly claim that they can instantly tell the difference from one cable to another because the soundstage got wider, instruments better defined, etc. Most of that is embedded in first arrival information, stuff on the order of milliseconds. By the logic you attempted above, you should not even have been able to remember a difference! But you did. Why? Because we don't remember waveforms, we remember the impacts of them, but the accuracy of those memories decay too. So if I play something now, and play it again 30 seconds later, and something in the image shifts 5 degrees, you will notice it. But if I played one now, and another in a week, you would not be able to accurately identify a shift and the result would be random. p.s. The test in the literature is a discrimination test, like positional accuracy tests. It tests a very specific processing feature of our auditory system. The funny thing is, tests like this within the domain of audio reproduction don't even need ABX testing. I simply have to test with 1 cable, look at my results, then repeat the test with a different cable and look at my results. If they are the same, the cable made no difference. Does not matter how long our audio memory is. Again, don't take your medical x-rays to your mechanic. |
edgewound67 posts 04-29-2021 12:21pmHarman Int'l uses blind testing quite frequently to develop cost effective products that the market will consume. Fear and ignorance. |
