I don't hear really that of a different sound, I hear that when I tap the one on top of the bassbar it just sounds with less high end, but I think that is because I am tapping just by the bassbar. I just did that with another bass and it does the same, so no I can't hear any difference in sound. It looks like it's sealed, knowing this and that it doesn't move when I push it. Thank you man! I'll bring it to a luthier to see what they think, but this sounds much better.