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High Efficiency Speaker Asylum: Re: We disagree on a couple of points by EGeddes

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Re: We disagree on a couple of points

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Some months back I read an interesting book called "Environmental Acoustics" (which is not about sound outdoors). Its theme was a discussion of the context of acoustic testing. One of the most interesting points that were made is the difference between instrinsic accuracy and extrinsic accuracy.

Intrinsic accuracy is the accuracy of the test, the signal accuracy, the control-ability of the test, the variables, things intrinsic to the test.

Extrinsic accuracy is how well the test can be applied to the world which its results were meant to support.

The use of sine waves is notably intrinsically accurate because they have a high degree of accuracy within the test. But their extrinsic accuracy is of questionable value since listening to sine wave is a very uncommon event - almost unknow outside of acoustic tests. I discount tests that use sine waves or noise for this reason, they are extrinsically inaccurate.

This is why I never use sine waves or noise, but always music, usually passages selected for applicability of the specific test.

Rather than quote my tests to you, it might be prudent to read them for yourself. Then at least you'll know what it is that you are disagreeing with. And I told my wife that I would correct something that I wrote in a past post. The actual subjective test was presented as "Lee and Geddes", not "Geddes and Lee". The "Geddes and Lee" paper was on the theory, background and proposed metric for the perception of nonlinear distortion.

Tom, its also difficult being the one who has to tell people that there baby is ugly. Of course you and many others here don't want to hear what I have to say, it doesn't support your positions and beliefs very well. But shooting the messenger has never been an effective way to discover the truth.

It's OK for me to give my opinion when it is in agreement with everyone elses, but if I disagree then all of a sudden I'm an opinionated slob.

It's far easier to agree with everyone all the time. It's a bit more difficult to shed light on the deepest darkest recesses of our beliefs.


Earl Geddes


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