tomp wrote:
Whatever you use for stuffing, the goal is to make the internal box volume look bigger than it is. Mind you I am not talking about vibration damping put on the walls. Up to a point, more stuffing make the box volume seem to go up to around 30% larger than it really is. This results in lower Fb and Qb. If you put in too much, the apparent volume begins to go back down. Another benefit of stuffing is the reduction in amplitude of internal acoustic reflections.
I think Steve is using TL speaker in which case damping is not the primary concern. The filling in TL speakers should absorb high frequencies and let tuned frequencies passthru. It takes several iterations of trial and error to get it right.