AmpLink audio clicking on CH 2
I have an experienced contractor that has 5 locations with ESP-880A and a PM8500 with an AmpLink card in it. He is using quality pre-made shielded 2-3ft CAT6 cables. In all locations the occasional popping and clicking is not in the DSP but only in the PM8500 and only on CH2 in all locations. He wired CH 2 analog out of the DSP and into the PM8500 and that has solved unwanted noises. Is there a way to get this to work as designed so that all 8 channels stay digital?
2 locations are running CSD 5.6 & 3 locations are running 5.7.