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Music servers and other computer based digital audio technologies.

RE: TESTS: Round-up of Windows and Mac Audio Players.

"I wonder if it would be more interesting to see these tests run in a system set up with varying levels of noise."


Assuming the bits are the same then any audible differences are all about noise. The question is, "What are the noise sources and how are these getting coupled to the listener's body?" Measurements that don't help answer this question are not going to result in any kind of progress, either for an individual audiophile, a manufacturer, or for the state of the art.

You are absolutely on the right track. Since it is very difficult to hear and/or measure these differences, one way to deal with the problem is to focus on the isolation part of the problem. By allowing the introduction of carefully created noise at fairly high levels one can measure the amount of coupling of this noise through the audio output, tracking down likely places where rejection can be increased, such as DAC input circuitry, USB to SPDIF converters, reclockers, etc... This is hardly a new idea. Radio repairmen were injecting noise and tracing signals back in the 1950's when I was a teenager. Sometimes this included measuring the results, other times, just listening.






Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar


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