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Re: All very well and fine, except for one little detail.

Bruno is not measuring he same cables as John.

How do you know? John has never provided a complete list of the hundreds cables he's measured the distortion of all these years. Do you have this list? If so, let's see it and I'll pass it on to Bruno and see if he's measured any of the cables on the list.

The salient point here is that even though measuring more than 20dB below what John's capable of, there's no sign of any of the distortion John has said he's measured in virtually every cable he's measured.

So if nothing else, if someone wants a cable that's drastically better in terms of distortion than virtually any cable John has measured, all they have to do is get some of the cheap A/V cable that Bruno measured.

I'll ask him if he can give me some specifics on the brand and where it's available.

You seem to think that just because Bruno says "the sound was exceptionally apalling" for one of the meausred cables, there still does not exist any sort of hard relationship between the cables John measured, and the ones Bruno measured.

I don't recall saying anything about Bruno's "exceptionally apalling" remark so where do you get that I seem to think anything because he said it?

End of any attempts to compare or relate the results of Bruno's measurements and John's measurements. You are showing ONE isolated measurement that shows very little cable distortion, while John has made hundreds of measurements on 4 different measurement systems.

What do you mean very little cable distortion? I don't see any sign of any discernable distortion in Bruno's measurements other than the generator's distortion. I certainly don't see the picket fence of high order distortion products all the way out to 19kHz that are shown in John's measurements.

And no, John hasn't made hundreds of measurements on 4 different measurement systems. What John has done is use 4 different spectrum analyzers to look at the output of his one 1700B.

Do I really need to point out to you that if the distortion John is measuring is being produced by his 1700B that it doesn't matter how many spectrum analyzers you look at it with? Using 4 different spectrum analyzers to look at the output of one distortion analyzer would only tend to indicate that it's not the spectrum analyzer that's producing the distortion. Not whether the distortion is being produced by the distortion analyzer or the DUT. Garbage in, garbage out.

You have NOT shown, via one simple and trivial null, that there are no measurable cable distortions.

I should hope not as that was never a claim I have made nor what these measurements were intended to do.

The intent here was to try and determine whether the distortion John has been measuring and claiming to be produced by the cables is in fact being produced by the cables and not by his measurement system.

Given that the Audio Precision System Two Cascade is capable of measuring well below the levels John's system is capable of and there are no signs of any distortion other than the generator's own distortion even when a cheap A/V cable is among those measured, it would appear that indeed the high order distortion that John has been measuring is being produced by his measurement system.

I think you're just grasping at straws here but if you'd like, I'll ask Bruno if he'd be willing to measure a Radio Shack Gold interconnect which is one of the cables John has measured and results in what is among the worst of John's measurements and see if it gives any different result.

se





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