or you can add chicken wire. Poly fill id suppossed to be in the center of the box. If it is ported, then you want to use the chicken wire to create a barrier anyways. but all my research points out that poly fill needs to be away from the walls of the enclosure. iirc.
Say guys im putting some 6x9 speakers in the grey carpeted boxes they sell do I need to put poly fill in the boxes also would it hurt if I don't use any don't really want to go buy some? Now I have some in my sub box.