Paul Webster wrote: 
> You should not connect a 6v supply to the RPi - at least not directly.
> Perhaps that power supply was intended to connect to the DAC which then
> had circuitry to protect step-down the voltage before providing it
> onwards to the RPi.

Thanks for the clarification Paul, you are right: Upon re-examination,
this power supply connected directly to the iSabre DAC which in turn
then passed on power to the RPi.

For the record, I am currently using an iFi iPower 5V PSU with the RPi 4
and will then stick with that. I admit I'm somewhat susceptible to the
"audiophile" snake-oil as regards wall-wart power supply noise and its
purported effects on sound quality - which surely exist - but everyone's
mileage may vary depending upon their particular situation...


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