The first unfold does actually retrieve additional data that is "hidden" in the lower 8 bits of a 24 bit MQA file.
The second "unfold" is upsampling and imposition of one of MQA's minimum phase filters. (so not really an "unfold" at all, consider that most DACs, including Devialet, upsample inputs anyway)
The third unfold is something written in MQA marketing documents, but other than that there is no evidence it exists. Maybe it just refers to the MQA filter, which does not make sense. All very confusing.
Regarding the Bluesound Node, I believe it can digitally output decoded MQA after having performed the "First Unfold". Any upsampling or imposition of the MQA filter (second and mysterious third unfold) is performed by the Bluesound's internal DAC.
The second "unfold" is upsampling and imposition of one of MQA's minimum phase filters. (so not really an "unfold" at all, consider that most DACs, including Devialet, upsample inputs anyway)
The third unfold is something written in MQA marketing documents, but other than that there is no evidence it exists. Maybe it just refers to the MQA filter, which does not make sense. All very confusing.
Regarding the Bluesound Node, I believe it can digitally output decoded MQA after having performed the "First Unfold". Any upsampling or imposition of the MQA filter (second and mysterious third unfold) is performed by the Bluesound's internal DAC.
1000 Pro - KEF Blade - iFi Zen Stream - Mutec REF10 - MC3+USB - Pro-Ject Signature 12
