Back in 2011 I built a 3 channel power amplifier based on Hypex UcD400HG modules and their matching SMPS400 power supplies. It has been my favorite amplifier ever since.
Now it has its own page on my blog, filled with construction details and photos. I have also included the schematic and PCB for the custom AUX power supply that I designed for the UcD400’s input opamp.