See post #606. RPi 4 would not boot with the official Pi power supply. ProtoDAC doesn't use much current, but the 2000uF of the C3/C4 caps might result in the power supply going into protection mode at startup.
Hardware: RPi Zero W | Allo Kali | ProtoDAC TDA1387 X8 | PGA2311 | Icepower 500ASP | Harbeth SHL5
Software: Moode 8.3.3
Source: Win 10 NAS
Software: Moode 8.3.3
Source: Win 10 NAS