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Re: Some comments

David,

Great points, all.

> Well, how about compression of drivers and the effect of that on transients and dynamics? There's also the speed that some components respond with and the effect of that on transient/dynamic performance but that could be considered a time-based error. <

But every one of those are easily measured using the four parameters I defined! Everything you mentionend will show up clearly in simple distortion and frequency response tests.

> Sorry but we don't always have the tools and models. <

Sure we do. You can easily invert a copy of the input to any device under test, combine it with the output and null out the original, and all that remains is the difference. Regardless of what effect caused the difference, it's trivial to identify the artifact completely and unambiguously.

> take a look at some of John Atkinson's comments about the lack of fit with his test measurements and the subjective reviewer's comments in Stereophile <

Without repeatability in the form of double-blind test results, all subjective opinion is meaningless and worthless. Now, if some of the things people claim to hear but that can't be measured were identified repeatably in a proper test, I'd gladly reconsider. As far as I know this has not yet happened. And there's a reason this has not yet happened.

--Ethan

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