15khz Spectral Dip in class Miles Davis Album, Tomaas

Matthew J Poes

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Hi Everyone,

I'm working on a project and stumbled upon a strange anomoly in the average spectral energy in Tomaas. In a High Resolution stream, I am finding that there is evidence of a low-pass filter at 15khz. It behaves very much like a digital brick wall filter, which is usually elliptical I believe. There is a fairly significant loss of energy at this 15khz range, medium Q. Looks like something in the signal path is causing it.

I noticed it isn't in every version of this song, but it is in the SACD and other similar High Resolution versions. It isn't in the Tidal MQA stream, but that stream has other issues.

Does anyone have any idea what would cause this? There is also evidence of sinus distortion, peaks in the response at regular intervals, something like 30 and 60khz (or 32 and 64, something like that). I've redone the stream capture multiple times and I keep getting the same results, and I've found it in other sources, so it seems to be accurate.
 
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