Tell us about yourself!
OK @cekPi7 how did you get the XM-4020 working with a direct current power supply? This amp seems to work only when it is connected to a real battery. I saw a blog post once where someone wrote up how the fixed that. Did it "just work" for you?
Zuul (Ghostbusters Terror Dog)
3D Printer Filament Dry Box
EEZYbotARM Mk2 - 3D Printed Robot