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Don Richard

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Everything posted by Don Richard

  1. That could be, but the computer could also be set up to switch amplifiers, speakers, wires, or whatever. I believe these testing devices are custom made, often in-house by companies that use them, and not generally for sale.
  2. That would work, but the computerized example I posted right above your post is more automated and adaptable.
  3. The listener has "difference" and "no difference" buttons they press. A computer randomly selects "A", "B", or "X" and records the results.
  4. No, he doesn't understand at all. ABX/DBT does not compare 3 samples at once. The subject listens to one sound sample, a switch is made, and the question is asked, "Is there a difference or not." Testing is repeated several times with neither the tester or subject knowing whether A, B. or X (no change) has been selected. The test equipment records the results.
  5. So you don't know the basics of ABX/DBT yet you argue about it? ROFLMAO
  6. That's not what was said. He said to do this if one DUT has EQ that cannot be bypassed:
  7. ABX tests for differences, not preferences. ABX testing: Audio will be played. Press the button, do you hear any difference, or not? AB testing: Audio will be played. Switch from A to B, which do you prefer?
  8. The results were essentially the same for both groups. This was a preference test for loudspeakers, which are easier to tell apart than amps or wires IIRC, both groups preferred loudspeakers with smoother frequency response and lower distortion.
  9. There is that. It should probably be part of every ABX test. Especially when the test samples are small. Small, as in a one person ABX. JBL did do hearing tests, as well as determining if a person participating in their preference study was a trained listener (musician, orchestra conductor, recording engineer) or not. The variance (a statistical term) in results was smaller in the trained listener group versus the regular people who participated.
  10. Obviously, but the goal should still be to arrive at the truth. The difference with audio that I see is that some folks dismiss the ABX blinded test as invalid when they can't hear differences. However, they do believe they can hear differences when they swap the same equipment while knowing what is hooked up. No proper level matching, no instantaneous switching, no controls at all, and the ABX test is the one that is flawed? Sheesh.
  11. If you were a horse, I know the drugs that would make the experience enjoyable😈
  12. It is very telling that you rather emotionally responded by on-line screaming "MY OPINION" and "100% NOT WELCOME" without knowing anything about the DBT that I was involved with. This test did not involve audio at all. It was a test to determine the efficacy of pain killing drugs. The bias removal was necessary because the test subjects could not communicate with the testers, and the testers' biases concerning the drugs that were being evaluated, favorable or unfavorable, had to be filtered out. The reason for the necessity of these controls, and the reason for the test subjects' inability to communicate with the testers was because the test subjects were horses. The tests consisted of putting a horse in a stall and hooking up a polygraph to the horse. A pinpoint beam of light was directed to a spot on the horse's leg so that it burned the horse. When the polygraph indicated that the horse was stressed, the time that the light was on was recorded. Varying dosages of the drug under test were administered and the stress test was repeated. The effectiveness of the drugs was determined by the increased time that the horse could be burned before showing stress. This test was much more involved than an audio ABX/DBT where the test subject only has to listen then answer the question, "Do you hear a difference" Your statement that ABX/DBT being "far from settled science" is ridiculous. It is a valuable tool used every day by scientists to make unbiased determinations in many fields of endeavor, audio included. Dismissing a scientific test because you don't understand it simply means that you are ignorant, and that's not my opinion, that's a fact.😁
  13. I do not think anyone is advising a person to actually set up a DBT on their own when making an equipment purchase. However, looking at the results of some blind tests may help a person with their decision, as well as considering testimonials, specs, price, and of course, personal listening evaluations.
  14. I'm a DBT proponent, but even I recognize that statement as an assertion in need of proof. That is a true statement for any properly designed DBT. I actually participated in the design and construction of equipment used in an ABX/DBT for a university research project. I can assure you that bias removal was a goal in the method we employed. You were the one who called ABX/DBT a religion and, as far as that goes, you are the one who is wrong. It is a testing protocol totally without supernatural overtones. (Disclaimer: when properly designed.)
  15. Religion? Blind testing protocols aren't "religion", which implies blind faith. These sorts of tests are scientifically designed to remove biases and emotion in order to reveal the truth. Some people, when faced with the reality that they can't hear a difference between expensive equipment and a less expensive component, exhibit an emotional response; "This cannot be - the test is flawed" or "So all amplifiers sound the same? Bullshit". Of course, the test is not flawed and only the two pieces of gear that were tested are proven to sound the same.
  16. I have observed the same. It's not an increase in loudness that I'm hearing but a change in timbre, and more than a subtle change.
  17. Looks great, should sound very good. Nice job!
  18. The Behringer X32 digital mixer is widely used for sound reinforcement and is rider-acceptable for "B" and "C" level acts. The Behringer EP series amps are QSC knockoffs and are used for sound reinforcement. Some professionals say they are not as reliable as the QSC amps they copy. I have never seen an A500 used in a pro application by anyone.
  19. $225 ? A fool and his money are soon parted...
  20. Solid state is what all of the recordings are made with.😁
  21. If it doesn't plug into 120 VAC it does not need UL certification. The wall wart or external PS should be rated.
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