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That's insane... I guess that is using the same technique for THD calibration as used in the ADC?

And there's no inherent reason why the APU and QA403 wouldn't work well together?

Ah, that's very interesting. And to clarify, the calibration is specific for 1KHz, i.e. that method of calibration does not calibrate THD at all frequencies simultaneously? Regarding point number 2, are you talking about the generation of the 1KHz sine wave itself? Would the solution to be to...

I'm in the process of gathering some test equipment.... I already have a QA403, but I was thinking about the possibility of adding a Cosmos APU so that I can accurately measure THD+N of very high performance DACs (e.g. ES9039). I was wondering if anyone uses a similar set up, or if there are...

I have what is probably quite a basic question regarding the Cosmos ADC, but I am struggling to find an answer that I understand amongst the many pages of information scattered across the internet. So, the factory THD+N of the ES9822PRO is -117dB in stereo mode. The Cosmos ADC is -123dB for a...