I know a number of people who bought Avalons and sold them because they couldn't set them up correctly.---
Audio is filled with enticing components which are really dead-ends towards achieving the proper tonal balance. Everything matters, including power and cabling.
One should start with the speaker which is potentially capable. Avalon Eclipse was not the one with the capability. I struggled for 7~8 years to make a decent sounding system. I failed. Without capable speakers, it is the dead-end. Don't waste your effort, time, and money at the dead-end.
When you have capable speakers, the right timber and balance are easy to achieve because you can hear it. Audio is fun with the hope and expectation that you will get there. When you don't hear it, everything become hard and complex.
I am happy with a simple tube system I have now. When you have a good sound with a simple system, who want walls of gears. One should start with capable speakers that one can hear what is wrong and right sound.