I have now increased the Rainbow. It also works so well, but if I want to do a few settings on the radio like Loud on on or on rock, pop or classic, then it’s 2 min good and then everything is just loud and cracking. Where could the problem be? I also have the feeling that on the right side of the driver’s side there is sometimes a short knocking or cracking, but think that it’s only that way with some songs, can it be?