Also interested in our filter experience -- I've recently finally settled on F1 on the upsampler, upsampling to DSDx2 and F5 on the DAC. I used to run F5 on both but back to back apodizing is maybe a bit too soft. Like you I run mostly Ref XL interconnects but also have all my Vivaldi boxes on Marigo footers which is a nice add on even though they're all in a Grand Prix stand