chances are its a source input issue.
to get sound out of multi, you need Analog (red/white) cables from each source. My guess is that you are using a digital cable which will not pass through to the multi output. The other ones work because they are designed to only put out one channel at a time to a different amplifier, not take a digital signal and mix it down to stereo.
GLad to see you get the niles amp, its a great unit and I have had many happy customers of them over the years!
to get sound out of multi, you need Analog (red/white) cables from each source. My guess is that you are using a digital cable which will not pass through to the multi output. The other ones work because they are designed to only put out one channel at a time to a different amplifier, not take a digital signal and mix it down to stereo.
GLad to see you get the niles amp, its a great unit and I have had many happy customers of them over the years!