Great info. This is absolutely not a critical listening setup. Big room, not great acoustics and usually listen from a BlueNode and occasionally things streamed from the internet (Brain Damage Pink Floyd podcast). I have an older Marantz MK11 that was used in a home theater that could be recycled as the pre/pro for this setup.
I'd absolutely love to put together a "nice" system but it's been over a decade for me and it seems like everything is new and confusing to me!