The JustBoom Amp (last one from PiShop.us) is also a traditional amplifier that takes balanced or single ended analog inputs, and should work with ProtoDAC.
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