I have a custom built AMD PC built on an ASUS motherboard. My DAC is an iFi iDSD Micro, with the iUSB Power and the dual headed Gemini USB cable.
Here is the problem. I get a slight high frequency noise upon playback. You have to get within a foot or so of the speakers, but it is there. The frequency is around 4 khz. I am guessing it is related to the frequency of the data packets, since it is an even factor of the 12khz USB clock rate.
This noise is only heard using my custom built desktop. I switch to my laptop, and voila! It is gone.
But I am quite partial to my desktop PC, and have no desire and really no resources to replace it at this time. But, I am wondering if going to a PCI USB card would be a solution? Something basic, or perhaps even something more elaborate, like the Sonore USB card?
Thanks for any input