Funny, I came across the Magik Box and realized I could do something similar with what I already have. My DIY Hifi Supply Django Mini passive Transformer Volume Control preamp has a switch on the back for 6dB gain, which I hadn’t tried. I flipped the switch, adjusted the volume control to compensate, and, sure enough, it was a nice improvement. The increased SN ratio brought more life, drive and better flow to the music.
Can’t say anything about what the the Magik Box does, because I haven’t tried it. What I can say is that implementing something similar in my system is very beneficial. High quality transformers can do amazing things.