Well, TTS appeared really fast. I thought that it as something with the song, or the fit, but after some tests I realzed that the right driver was sounding at a lower volume. I just half-opened the mesh and stuffed some cotton there. Problem fixed. Thanks for the quick fix
Ok ok, I should do it. I did take a look a while ago, and thought that getting the filter off might be tricky. But it sounds like it shouldn't be afterall.