@caglioti How did your XP12 end up for you? I know, very old discussion. I'm curious though.
Someone mentioned that it could be the Blue Jeans cables, and although I never used Blue Jeans ICs, the Blue Jeans speaker cables I still have in storage will put up a massive veil and muddy up everything, pretty much destroying image definition and adding a feeling of drag. So, I'm wondering if the ICs were the issue, or if you found the XP12 sound change over the course of the first week or two? Thanks