ProtoDAC TDA1387 X8 project

[springle19]

One of my Protodacs is fed by a Kali, one is fed from the output of a DIYinHK USB to i2c and another from an AK4137 resampler and none produce glitches.
I will try Pi direct and report.

An hour or two now Pi4 and ProtoDac via i2c MoOde 9.05 and no clicks or glitches. Tried with both Software and Fixed volume settings.

(Powering Pi and ProtoDac from Salas L-adapter so plenty of grunt there. 
When I first plugged the ProtoDac into the Pi4 using another Official Pi power supply it would not boot...greedy little ProtoDac   :-)

Bob - to be clear, you're saying you have the ProtoDac powered by the Pi 4 via the GPIO connector, but using a single Salas L-adapter? 

I have the same physical configuration - ie I've slotted the ProtoDac directly on top of my Pi 4. However, in my case, the whole combo is powered by the standard USB power supply which comes with the Pi 4, via its USB socket.  Your view is that this may not be juicy enough though for the combo, yes?

Re other variables, am using the same cables and input sockets on my amp as I had for my first cheap/cheerful Chinese DAC which was limited tonally, but glitch/click free . . . . so I don't think my clicking issue is either of these downstream factors

I'm open to any more ideas!

Best, Simon P