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RE: Fascinating that MQA re-invented the . . .

> While you may feel that MQA's implementation of a similar technology to
> Ayre's Minimum-Phase filter is an unexpected tribute to Charley, John, I in
> all due respect must disagree. If MQA threatens the availability of music
> in any other format, then the technology remains a direct slap in the face
> of everything Charley spent the vast majority of his life working towards.

Appreciate the response, Ryan. We did examine the DRM aspect of MQA in
an earlier Stereophile article; in the article being discussed, I was only
examining the time-domain behavior of A/D converters - in that context my
tribute to Charley was that the QA-9's Listen filter and the experimental
complementary filter for the QX-5 do what MQA is claimed to do.

But as you point out in another posting, commercially available recordings
made with the QA-9's Listen filter are extremely rare. More's the pity.

John Atkinson
Technical Editor, Stereophile

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