I wanted to add another question to this topic. I'm ordering about 40 ferrite cores for my power cords and any cable that transmits digital data. Should I also use ferrite cores on analog cables or would that just cause other problems? The reason I ask is that you normally see power cords and digital cables such as HDMI and USB with ferrite cores pre-installed, but you don't typically see analog cords such as component or RCA with ferrite cores and I was wondering if there was a reason for this.