This project started while I was “locked up” during Covid (My wife and I had it - I had one day in the hospital, she had three). I initially only wanted a tube-based amplifier, but the project evolved into what I have dubbed an “Internet Receiver” containing a Raspberry pi 4 with touchscreen and HiFi Berry DAC+Pro. Outboard is an active crossover by KMTech encased with a linear power supply for the amplified sub woofer, an “Enigma” I found on DIY Subwoofers, providing that bottom octave, albeit not flat. The Satellite speakers are Dayton Audio “Avia Trix MTM” which go down to 40 Hz. I wound my own toroid power transformer, and used a modified Bruce Huran “Junk Box Amplifier”. It is in a welded steel chassis with a divider for the power supply section. Volumio free version works without a hitch ( I had to rotate the screen) and I have a USB stick for a bunch of oldies ( I’m 78 and an oldie myself). My favorite internet station is " Antennae Bayern Oldies but Goodies".