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Charles, Please tell me if this makes sense.

This is a 44.1/24 recording. The gap seems centered on the Nyquist frequency. The original recording had a sharp roll-off--I know this because I measured it myself (see attached; one is the original CD. The other is MQA.). MQA has a slow roll-off filter, so it passes aliased content above the symmetric gap. I've got no idea what the bump is in that spectrum, between 40 and 45 kHz; I don't see it in mine.

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