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opamps THD+N/IMD/SNR measurements don't mean jack IRL, so let it go humm'kay?

Discussion in 'Sound Science' started by leeperry, Dec 31, 2011.
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  1. maverickronin

    I think your context was a little unclear as well and you might have been misunderstood.  I couldn't tell What you were implying either so I just gave the most reasonable interpretation of the experimental results.  I have actually seen people make arguments as lame as, " DBT fails to identify the Stradivarius.  We know the Stradivarius sounds better.  Therefore DBT doesn't work." which is how your post got interpreted.  I've actually seen even lamer arguments than that here on Head-fi.

    I've been back here for nearly 2 years already...
  2. MacedonianHero Contributor
    FYI...just out today:
  3. Rdr. Seraphim
    Some more food for thought: http://www.avguide.com/forums/the-difference-between-medical-dbts-and-audio-dbts
  4. jcx
    amazingly lame "critique" from a non-expert in psychoacoutic testing  - only a "rally the base" article not a useful addition to "the debate" - the subject is treated much better by threads here even
  5. khaos974

    Keith W. is strawmaning quite a bit I think, he is considering what audio objectivists already consider bad practice.
    - Sample size and quality: he has a point here, no one has millions of dollars to recruit thousands of participants for audio DBT, Meyer & Moran did manage 500 though if my memory is right.
    - Short periods of time on an unfamiliar system: but most audiophile objectivists would recommend to DBT on your own system at home on familiar material
    - Not knowing what we are looking for: However most objectivists would consider that the steps to an audio ABX consist in first identifying what's different in sighted conditions, image width, more treble..., and once those have been identified, try to do the same blind.
    - Power calculation: Sure, but considering that no serious DBT has ever had a positive result for (normal) cables, calculating how many positives one would need to have a relevant result is premature.
    His conclusion somewhat makes sense though, we should organize more rigorous DBTs.
    But audio objectivists are already aware of the limitations and requirements of DBT, I would almost tentatively say that a lot of half baked DBTs are done by subjectivists trying to score a point.
  6. mikeaj
    DBT is just a small part of experimental control and non-laughable testing standards, obviously.  It's not always necessary or feasible, though preferred when applicable, and experimental design certainly doesn't stop there...
  7. Paul Clark

    Have you considered a reading comprehension course?
    Wow! 2 years?  In reading comprehension?
  8. Willakan
    Before we all start mudslinging, let us focus on the real subject of this thread: leeperry's utterly fallacious reasoning. It's kinda fun, playing "Spot the Ludicrously Large Logical Hole," "Spot the Ad Hominem" "Spot the Biases At Work"...
    His recent posts  provide an incredibly good example of confirmation bias, whereby the subject subconciously dismisses anything which disagrees with their current position and takes as gospel anything that doesn't, although I'll have to say the effect isn't meant to be quite this strong. Case in point: Ignores everybody and all links until someone agrees with him, then cites them as the "technical answer" which proves he is right... (Prediction: Will either not respond to my post or claim that I am biased LOL IRONY and spin it into reasonably well disguised personal attack)
    I am reminded strongly of a quote from a creationist mentioned in the introduction of The God Delusion (note this is purely for purposes of demonstrating the absence of logic in what leeperry says rather than to start an inappropriate debate) - I shall paraphrase:
    "Even if all the evidence in the world turned against my ideas, I would still believe them, as they are based on the irrefutable word of God."
    Here God is sighted listening. Some people find it incredibly difficult to understand that their ears and other people's ears are not infallible, not on a logical level, but on a "But I heard it" level. Hence they construct elaborate arguments to justify their position to themselves, which are terrifying fascinating in a worrying sort of way - very few are able to admit what the above individual does - that their position is essentially irrational (I don't think he does completely: I think he might have been quoted out of context!).
    Once they admit that, I'll leave them to it[​IMG]
    A member of the Stereophile team presented a paper at the AES some time in the 90s. His conclusion was that there are unmeasurable, completely unquantifiable things in audio which are impossible to verify as any attempt to verify them with blind testing and the like renders them inaudible. The mechanism by which this occurs is not important as the differences are clearly from the equipment, because.
  9. maverickronin

    In related unfalsifiable hypotheses I have the unfailing ability to predict winning lotto numbers as long as I never write them down, tell anyone else what they are, or buy a ticket myself...
  10. Chris J


    Note from the back of the bus to Mr. LeePerry,
    Please tell us exactly what conclusions you drew from this? Cos I'm a little bit confused..............[​IMG]
    Warning: technical blablabla ahead!
    Please note:
    You do not properly design in an amount of feedback into an Op Amp circuit.
    You design to meet a specific or desired amount of gain for your application, in our case typically 0-20 dB of gain in most headphone applications.
    In an Op Amp circuit, it's not unusual to see 60-80 dB of feedback in the middle of the audio bandwidth.
  11. Willakan
    I mentioned confirmation bias earlier: Wikipedia notes how it causes people to misinterpret things that strongly criticise their position as supporting it - even if they are aware that it criticises them at the time, they are relatively likely to either forget it or incorrectly remember it as supporting their views (the former is rather more likely, admittedly).
    I was mistaken in my statement that leeperry had found a statement which appeared to support him: I apologise unreservedly for any offense caused.
  12. Head Injury

    It's gotta be quantum mechanics.
  13. maverickronin
    Actually my pet dragon tells me telepathically...

  14. Willakan
    Now you've done it. Someone will promptly talk about how stupid we are for rejecting the audiophile hypothesis more than "tentatively" and some other people will insist that there isn't "enough evidence." to make a call either way[​IMG]*
    *The above post contains elements of humour. Got to be careful on this sort of thread...
    Normally I would now say "Back on topic:," but I'm not sure this thread has a topic other than how silly those are who think that the premise that opens it makes any sense.
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