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In Reply to: Why wont ABX show a difference? posted by Jerry Parker on November 27, 2002 at 23:31:48:
My take is that the human mind does poorly in making a decision like this. I also found that ABX testing was useless for me to tell the differences between similar products or designs, yet my friends and I could hear the differences in more open testing, such as a blind A-B test. I mentioned this in a LTE in1979 to Dr. Lipshitz and the other avid ABXers, but I have never gotten a satisfactory response. They just don't believe me. Once Dr. Lipshitz wrote me an LTE where he said 'roughly': "Your math is OK, your measurements are OK, BUT it is impossible for you to hear differences between caps. ... We have tried it with ABX measurements, and always got a negative result. " These are not the exact words, but that was the point. What can I say? Walt Jung sent Dr Lipshitz some of the worst sounding tantalum caps he had ever found. Guess what the ABX test found? NOTHING!
Follow Ups:
Did they drop them into a speaker crossover, or into an amp?? How did they switch them??? Woudn't the audibillity be usage/circuit specific?? Also is it more audible with different types of signals such as when they test compression codecs? Some codecs do better with some signal types than others.
I assume that you are talking about tantalum caps in this case. You have to ask Dr. Lipshitz about the test particulars. I am not here to discuss ABX details, but they can be found in issues of 'The Audio Amateur' in the late '70's.
nt
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