I have a set of LTB headphones. These headphones are designed for use with a PC. They have an amplifier that is powered from the USB cable. Unfortunately for me, my DFI mainboard seems to have really dirty power on the USB ports, which causes buzzing and clicking. A fair number of folks have this problem with the headphones and the official fix is to "use a powered USB hub" instead of connecting directly to the PC's USB port.
I'm hoping that I can clean the power up by simply adding a couple capacitors to the amplifier (or even USB ports on the mainboard).
Since this isn't noise at any specific frequency, I'm not sure how I can choose the most effective values for the capacitors.
I'm also wondering if a ferrite ring would help here?