that is the motional feedback of the cone that send back a signal towards the amp, not saying also the signal is AC so change direction all the time making the caps a zumba dancer. The best way to avoid the feedback of cone motion is not to listen to music ! Problem solved. ![Giggle :giggle: :giggle:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![fight :fight: :fight:](https://files.diyaudio.com/forums/images/smilies/fight.gif)
![fight :fight: :fight:](https://files.diyaudio.com/forums/images/smilies/fight.gif)