I want to run a new miniAMP on a new Raspberry Pi 4 with this speaker. We tried to setup with the current Raspbian Pi OS like several guides - including your own - said and couldn't get it to work. Afterwards, we tried with a fresh install of HifiBerry OS. It detects the correct board, but there is also no sound. So I thought the speaker might be the problem, but that one works on a different amplifier well. So might the board be broken? How can I test this? I am glad for any hints!