Listening comprehension. I just realised that I have to find native speaker's recordings containing a dialogue or a discussion between two or more people. Muffled, sometimes unclear recording or background noise would be a bonus.
How did I come to this conclusion? Well, I remembered (recalled?) one day, when I joined a voice chat with a bunch of English speakers discussing something and I quickly realised that my brain can't keep up with what they're saying. Sometimes I'd figure things out retrospectively (with, say, a five-second delay), sometimes I wouldn't. The reason for that being that a dialogue between two natives tends to include all sorts of things, like fast speech, omitting sounds, and things that I can't find in a prepared speech.
You might say: "But aren't movies what you're looking for?". Maybe. They for sure can help with that. But I think there's more I can discover in authentic, off-the-cuff speech.
I have one or two websites in mind, and I can probably dig up some more, but I wonder if you can recommend anything.
Great idea. I think that's the best way to go about (approach) listening comprehension. Get used to natural speech, despite all its inconsistencies and inconveniences, and when someone actually speaks clearly, you'll see it as a treat where you can metaphorically kick back and relax.
Sounds like what you're looking for are podcasts or youtube videos with multiple participants. I'm sure there are plenty of those.