MQA is a little controversial, e.g. refer to thread here, link and link. MQA-CD seems to be a derivative with a resolution of 44k1 16bit on ordinary CD players [source]. If I’m not mistaken then it can unfold to higher resolutions on MQA-compatible encoders. I guess the CDS50 is not MQA capable and this device produces a 41k1/16 PCM audio stream to your SA30. The SA30 does not see the MQA information so it cannot decode it. In order to use the MQA capability of the SA30 you have to feed it an MQA stream, e.g. from your NAS (or use a subscription service like Tidal).
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