The crosstalk is likely caused by the AV receiver not fully isolating the inputs from each other. Can you power off the sources not in use?
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I suspect the issue is related to configuration with the Marantz AV8802a. I have an 8801. It has been some time, thankfully, since I have fooled around with configuration settings on it, but memory serves I had somewhat similar issue years ago. I suggest taking an extended look at the individual input sources and assignments you have configured in the Marantz as well as the Input Mode for the assignments. You may also want to discuss with Wolf Audio on this as well, since they offer more than 2-channel audio via their products, and the configuration matching with the Marantz may be playing a part.
You have some very nice pieces. T+A gets excellent user reviews. I too have a Sander's Magtech and have been very pleased with performance and support. Roger Sanders is a class act. I am musing about what direction I may pursue for server upgrade and Wolf Audio has been one on my radar. Best of luck in resolving this issue.