Total posts : 45366
Hi 1580:
I am thinking about the audio line that feeds the input to your AMT5000.
Is it balanced or unbalanced?
Is it shielded?
What is the line level of that audio feed (i.e., -10dB, 0dB, +4dB)?
Try removing the AMT5000 and attaching an audio amp/speaker to check the audio quality in that feed line.
