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I'm on 230V/50Hz power and this is the measure noise performance: Is this a ground loop?

https://www.analog.com/media/en/dsp-documentation/certificates/Decoder-Certification-Final.pdf I believe the 21573 is used by the two top Denon/Marantz models and Emotiva. Interesting to see that MPEG-H decoding may well be ready by now, anyone heard of it being used in anything consumer...

Was hoping for some thoughts on if running something like the 1.2Mhz FFT used for amp testing would be useful for source devices too. The reason I'm interested in this despite it being well outside of the audible band is that some digital amplifiers (eg. Hypex) supposedly will reproduce any...

I have a new prepro and seems to be suffering from this. The hiss is nothing like ground loop hum I have heard in the past; it does not vary at all with volume, remains completely consistent in tone and volume and does not change with input selection. The hiss starts as soon as a relay clicks...