@in_shore, I have not jumped off a 10 story building yet either, but based on laws of physics, general knowledge of what the human body can withstand, and similar things happening to other people, I know with a great deal of certainty it will kill me.
Being very knowledgeable about electronics, DACs, and async USB DACs, I know, without a doubt, that the DAC will generate its own clock completely independent of the incoming data stream. That is how they work. A simple reclocking of the USB not fix any issues with the output clock, but if you believe that is the case, a highly fixed clock that is not synchronous with the output clock is just as likely to create a larger fixed harmonic on the output as it is to fix anything. If the input clock is random, at least clock induced noise would be random, i.e. harder to hear, than a highly fixed/periodic one.
On the other hand EMI coupled via the ground connection and data connections, and the power connection if used in any way, can absolutely play havoc with the stable operation of that output clock if the DAC is not well designed and the ops DAC is not very high end. That noise could also couple into sensitive analog circuitry.
Last, I stated quite clearly, that sure, try it out. The power filtering could quite possibly improve the overall sound and the op may be happy with the result. However, for that much money, it would make far more sense to invest in a significantly upgraded, new DAC with better isolation of the USB from sensitive circuitry.
