When I was in high school I worked at a Sears down the street. I got to know a lot of people there and used to talk to some of the Loss Prevention guys. Their office was a dark room kind of between the admin offices and the back room warehouse. Inside was a wall of small TVs (maybe 12-13 inches?) from all of the CC feeds around the store. All CRTs. I went to follow one of them in once and it was like a forcefield. The whine of all of those TVs was enough that I stopped cold at the doorway. They laughed at me and gave me shit about it. I never was able to go in that room.