If the Pro feeds a competent dac then its optical out should be sufficient.
i.e. there shouldn't be a need for a stronger power supply, and the dac should be able to eliminate any clocking / jitter issues.
Or at least, my Pro optical into my RME dac sounds marvellous!
I've not heard any improvement using other streamers, nor coax or usb.
Yes, it's been reported a number of times, for both the Mini and Pro, that the power supply adapter itself needs to be of reasonable quality / provide the required amount of power.
As I see it, that's not really an issue with the Pro, but with the usb adapter used to power it.
I'd hope the dp450 sounds good!
Enjoy.
I guess some of those reviews are lauding the use of some linear power supply or other. Using something half decent like an Apple phone charger or a Raspberry Pi power supply is more than sufficient, especially when you're using the Pro as a transport and have it connected to a competent DAC
