I upgraded from AZ Matrix II to Absolute Copper.
The Matrix II are awesome cables. Can’t call out any shortcomings until compared with the Absolute Copper.
The Absolute Copper are more detailed than the Matrix with better texture and tighter bass, more extended highs and more fleshed out midrange. I would not call these cables warm by any means. The Absolute Copper will be more refined than the Silver Refs.
What speakers are you using?