So I hooked up my crossover test box with some amps (Cyrus One and a six channel Rotel RB-976 Mk2) giving me 8 channels of fully active randomness. And then I remembered the PCM4202 reset issue.
The PCM4202 has a decent internal reset, it waits for the supply voltages to stabilise, and then waits for the system (audio) clock to be present before initialising. But that isn't good enough, sometimes it starts fine, but other times it is noisy (lots of background noise), or the audio is distorted.
Oh well, I was going to hook up an extra reset from the DSP-ADAU1452 board reset output to the manual reset input on the ADC-PCM4202 board. However not sure this will fix everything, If the ADAU1452 is presenting a valid output clock on startup and then switching to my desired clock at a later point in time, it will make no difference. I need to capture the startup behaviour of the clock, but that is easier said than done with my kit.
*Sigh*... nothing is ever that simple.
An electronics engineer and a long term electronics hobbyist. I like tinkering with stuff and making things.