Proper design in cables alone will not completely get rid off EMI noise and in some cases even RFI. This is because so called high end audio components today are not built properly, poor grounding, poor shielding etc. Yes, you want to have good qiality and properly designed cables that will help not introduce more junk into the components but most components will inherently have some. I was made aware of this when I started looking at properly grounding my components and was further astonished when someone introduced me to a passive filtration device called "Troy" from tripoint audio. After grounding my amps, preamps and Turntable to the tripoint audio box, the level of darkness, clean upper frequencies and just overall space and music flow was jaw dropping. I am an importer/dealer in the South Florida area and I invite any of you to come by and listen to an A/B demo.