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Technical and scientific discussion of amps, cables and other topics.

RE: That clears up a lot!

"a memeber [sic] here reported after reading the full report that "... the test description and analysis is surprisingly thin. No equipment readout, no results breakdown by listener or location or whatnot, no detailed description of listening venues, no musical selections. No null hypothesis, no description of type I/II error."

Okay, again you are read someone else's opinion, accept it as gospel, and insist you know what you're talking about on that basis. You seem determined to critique the paper without reading or really thinking about it, so I'm about done with you.

Each of those criticisms, as it happens, is either untrue or irrelevant. The exact equipment doesn't matter because it was well chosen and was good enough for the test (we're preparing a more specific list, to be made available to those who have read the paper and wish to know). There were several venues, all chosen for the excellence of the room; one important criterion is that the background noise must be extremely low for enough detail to be heard, and we measured and reported this.

There is little point in burdening the reader with individual listener data -- though we checked their high-frequency hearing limit of most subjects, since that seemed possibly relevant -- when not one person could hear differences with music at normal levels. Most subjects listened from the sweet spot in our main system, of which there is a photograph in the paper, but again no one, sitting anywhere, passed the test.

A list of musical selections will likewise be made available; we submitted one with the paper but it was not published. The null hypothesis -- that there was no detectable difference between the high-bit audio and the same signal passed through our codec -- was obvious from the paper. Type II error (Have you read Leventhal's paper? Somehow, I doubt it.) is relevant only when there are results that show positive correlation, but not enough of one to meet the 95% confidence limit. We had no such data. No one even came close.

"I mean really! Is this a reflection on what passes for "science" for the folks of "demonstrated competence" at the "scientific" journal in question?"

The idea that the people who actually do the work in the audio industry are all fools, who neither know what they're doing nor understand anything about scientific procedure, is bandied about rather easily around here, I notice. Saying such things just makes you look bad, a job I leave in your competent hands. -- E. Brad Meyer



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