The magic that I believe the mantle is imparting comes mostly from the transformers in my opinion. Every piece of gear I own that has transformers does that "thing" were it seems to expand the sound out at the edges and saturates it. Hard to explain without having my board in front of me (and your ears) but after using either of my two color box mk2s or my RNDI, I wouldn't be surprised if my gig rig also has (Super Vintage in my case) a transformer in it because it gives the same effect while adding the tonality of the amp that inspired it. I personally haven't heard any overly compressed Youtube demos that impressed me really but at it's price point, I'm not that interested in it considering the options I already have. Using my RNDI with my Bass ParaEQ at the end an a DCX bass up towards the front can give me all I need (and more) in terms of what the mantle brings imo. You most likely can also get some of that transformer mojo from a
Lightning Boy Audio 23Fe+ and/or a
2020S, not experimented with them yet but they look promising and the reviews seem pretty good. Supposedly they are fantastic after drives so I might put one after my DCX to see what happens when I push it. Never know when you might need an even SMALLER board so having transformers I can just plug in directly and store underneath the board sounds appealing.