EMI noise

I just got the monster power AC/EMI noise sniffer like the one we see in store that sell monster power cable. Now I can understand what AC noise is and why we need power conditioner. But it also detects a lot EMI noise around my blu-ray player and my pre-amp. Should I worry about that or that just the way it is?
If you like, you can treat your player and preamp with
EMS Sheets. These are said to absorb/block some of the radiated noise, and are available from Michael Percy Audio.
See this link for a rerference: