Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics.

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Total stuff and nonsense!

Posted by jj on November 15, 2002 at 18:27:40

In Reply to: Umm posted by RGA on November 13, 2002 at 20:02:04:

I hardly know where to start. For instance, you say: ***According to typical DBT ABX tests, Tapes are indistinguishable from CD and LP is indistinguishable from live music. Thus if you support that kind of testing then you may as well buy tapes from here on out...besides they're cheaper.***

That statement is totally, abjectly and completely false. Why did you even bother to say it. Over and over and over again, positive results have appeared, even in not very good ABX tests. This is a FACT, one that is well documented in the literature, quotes of which we have all seen already.

And then : ** Validity requires the test to be conducted in the environment for which it was designed. This equipment was designed for long term musical enjoyment not 5 second switching. SOme argue you can just make the test longer. BUT NO YOU CAN't because it goes against short term acoustic memory. but then etc etc etc. and you're in a feed back loop of endless problems.***

Another total, abject misstatement. In a properly executed test, YOU control when you switch.

It is a FACT that it is clear that once YOU LEARN WHAT TO LISTEN FOR, you will learn where to switch, why to switch, and you WILL ANSWER THE TEST TASK QUICKLY. Acoustic memory IS fleeting, but you don't have to listen to 5 second snippets to avoid that. 5 seconds, in any case, is a pure straw man, since acoustic memory so 200 milliseconds or less.

The only issue in switching is that when you WANT to switch, you must be ABLE to do so quickly. There is no requirement that you switch band and forth quickly, that's pure nonsense, and if someone is trying to give you a test where they require it, yes, you should raise your eyebrows a wee bit.

Then, as to your assertion that trials must be longer. What you meant is that there need to be more trials, and you're wrong about that, too.

In short-term tests, where 3/4 repeated twice, in a self-training threshold test, is "success", even not very experienced subjects very quickly learn to hear down to their absolute thresholds as measured in other much more difficult ways. This is another result that's all over the literature in JASA, and it shows that if something is detectable AT ALL, it is nearly always detected in A GOOD TEST.

First, your accusations (I can't call them even pseudo-facts) about what DBT's show are simply false. Then, your conclusions, such as they are, fly directly in the face of massive evidence.

Why did you write what you wrote?
JJ - Philalethist and Annoyer of Bullies

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