Popular Post austinpop Posted August 15, 2018 Popular Post Share Posted August 15, 2018 1 hour ago, John_Atkinson said: If you read my article (which isn't specifically about MQA but about A/D conversion in general), you should note that the filter I mention that is free from ringing is the Ayre QA-9's antialiasing filter at 2Fs and 4Fs rates in the its "Listen" setting. Yes, the QA-9's Listen filter allows for image energy to fold back below Nyquist but both Charley Hansen and Bob Stuart have pointed put that at 2Fs and 4Fs rates, there is very little musical energy to be aliased. Ayre's reconstruction filters in its D/A converters are minimum-phase types that ring, either for a short time (Listen) or longer (Measure). The Ayre D/A filter that doesn't ring is an experimental type that Charley Hansen sent me during the discussions we had on this subject before he passed away and that I refer to in the article; it is not available to owners of Ayre D/A processors. So as very few commercial recordings have been made with the Ayre QA-9's Listen filter, it would appear that if removing so-called "temporal bur" is indeed something that improves sound quality for the reasons I explain in the article, the MQA process is one of the few commercially available end-to end solutions that would do that. If... John Atkinson Editor, Stereophile I, for one, found your article very interesting. Not everyone here on CA is rabidly anti-MQA. I remain agnostic, but have to say that I have not had an AHA experience with an MQA recording. I do find the MQA Core decoding of Tidal Masters in Roon to be a quite decent step up from the Redbook equivalents in some cases, and this can be enjoyed on any DAC. Once Qobuz streaming becomes available in the US, I may find Tidal and MQA to become completely redundant. We shall see. daverich4, rando and Derek Hughes 3 My Audio Setup Link to comment
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