(17-Mar-2020, 22:50)thumb5 Wrote: It seems from these two posts on ASR that Alex was mistakenly referring to specification for the digital inputs of the AP test equipment, which aren't relevant to the measurement that ASR carried out based on the analog output of the DAC fed by the ER, and that the test gear is more than capable of measuring the levels of jitter UpTone refer to at the DAC clock (whether or not that is the right thing to be measuring).
Remember though:
The analog inputs of the Audio Precision go through whatever A/D converter is built into it. It is a 24-bit ADC (plus filters), but jitter specifications for it apparently are not given anywhere. I suspect (but can not confirm) that the jitter specs for their A/D converter are the same as for their digital inputs--could even be worse. Plus, Amir is not zooming into the skirts of the jitter spectrum spike, so you really can not see what is occurring at close-in offsets.
Music lover; Owner, UpTone Audio LLC
