If you have a channel and notice that you dropped a few subscribers... That means the subscribers lost were either unsubscribed to you or were suspended channels (terminated, banned, ect.) This effect will take place on June 16, 2014. This will allow you to have a truthful subscriber count or accurate subscriber count.
Article - youtubecreator.blogspot.com/2014/06/making-sure-your-subscribers-count.html
Article - youtubecreator.blogspot.com/2014/06/making-sure-your-subscribers-count.html