Recently I’ve been having an issue with my Acoustimass 6 Series III Subwoofer module. It makes a clipping noise, like a metal plank is being hit. The noise is made when deep bass sounds are produced. I realized that the sound is coming from the transformer. I noticed the transformer is loose, so I proceeded to tight it. It is no longer loose, but here’s my doubt. Does the transformer should be a little bit loose due to the prolonged bass movement? Or it should be tight?