Second, there are separate volume controls for each channel, pretty much guaranteeing you cannot set the two channels to identical gains without a diagnostic tool.
Yes I did read this. That is why I mentioned the appilizer. I have seen many people break out the phone with the JL app. Not that recommend it.
He also did not mention the brand of DA system. Perhaps it does have the capability to adjust sources. There is another post i believe you are involved with regarding a Marantz SR 5008 where the person is asking for similar help and in the manual is the info. I thought I might bring it up.
