I like to keep a mixture of German listening material in my iPod. On the one hand I have the sound files from Lingq material that I have already gone over or are currently working through, and on the other hand I like regular radio pod-casts (Kuchen Radio is fun). Typically I listen to stuff that is quite high level, despite my vocab being quite limited (nearly at 5000 now). At the moment I am listening to GEO radio programs for example. The reason is that the 'harder' material is also simply natural material, not made specifically for beginners. The more artificial easier stuff was necessary when I had no comprehension at all, but already now at high-beginner, low-intermediate, I prefer to listen repeatedly to so called 'advanced' material. After a half dozen listens I am picking out quite a lot.
I agree with don about the pointlessness of listening to things you can't understand at all, but I don't advocate forcing yourself to listen to things near your level if you are not interested in it. If your comprehension is near zero and you are simply blocking it out, then it is not a very good investment of your time. However even if your comprehension is partial (say less then half), if the topic is of interest to you it is easy to be more alert and notice lots of patterns.
There is also a difference between lack of comprehension because of limited vocabulary, and lack of comprehension because of speed. If your problem is more of the second variety, then lots and lots of listening is very effective. With Japanese I started listening to regular radio programs all day long in 2010 when I still only had perhaps thirty percent or less comprehension of what I was hearing. I was also studying at the same time of course, but my vocabulary was still short of advanced. Within a few months of near full time listening I reached perhaps 90 percent comprehension of radio/TV. This is that epiphany moment Lucas talks about. I note that this finally happened after seven years of poor methods and attempts to study my way to understanding.
A few relevant articles. ^^http://www.alljapaneseallthetime.com/blog/10000...http://www.alljapaneseallthetime.com/blog/isnt-...