AndrewOld
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Yes you are correct in that, but it's the supplied power over the USB coming from the source that would be the issue especially from phone's. It's their battery playing time that would suffer
Galvanic isolation is only really necessary with very old, electrically noisy PC's and laptops. This was because they had relatively primitive switching power supplies. These were Operating at relatively low frequencies This area of technology has been going through a revolution over the last six or seven years with vast improvements occurring. There were many more old source products around a few years ago. Modern laptop, pads and PCs just don't have the levels of ground modulation that would cause problems these days and phone's have virtually none at all so because Robs DAC technology is immuned also to Incoming jitter we felt it was not necessary to include galvanic isolation into Hugo2
If that is the case, why does Rob himself use his DAVE with either an Audioquest Jitterbug or from batteries? Does he not have a modern laptop?