
Here we go again...
Allo make some well engineered hardware. They also play into the sort of audiophile myths you'll see Darko and Hans perpetuating. Take the
DigiOne for example - it has demonstrably lower levels of jitter on its S/PDIF output than the Topping D10 it was measured against. The problem is that for any well engineered DAC this won't make any difference at the analog output because the DAC won't be sensitive to jitter as shown in the many DAC tests here and elsewhere. That's why in the
DigiOne Signature test a DAC with known poor jitter rejection was used. Similarly there are DACs with poor USB implementations that might potentially be helped by a 'special' USB device, but it would be better to change to a DAC that didn't have a problem in the first place. Noise issues due to grounding are another matter entirely, but measurable and demonstrable, and with known inexpensive solutions.