Anyone Damp the insides of your Speaker Cabinets?

All loudspeakers sound best when they are as close to inert as possible. Vibrations just cause "fuzzy" sound. Before you go stuffing the insides--1st seriously consider reducing/eliminating vibration by bracing the walls.
Adding stuffing material will affect the bass response whereas bracing simply eliminates resonances. I have used "well seasoned" i.e.- old- coffee table legs of oak and mahogany to excellent effect. Use PL Premium glue and a snug fit. You can't go wrong by minimizing vibrations this way. It's well worth it.. You will end up smiling with the enhanced clarity and dynamics.

B_limo. Interesting tough question that companies like Wilson, Rockport, Magico, Focal, YG, B&W, Dynaudio and others never stop working on. Of course as businesses they must concern with trade-offs. Your question-the best-need not consider trade-offs. I think this question is worth its own thread. I believe there are many knowledgeable, educated people who we hope would contribute. (Will you start the thread?-or shall I, as it interests me greatly as well.) I still have a pair of 1985 JBL 250Ti's whose sound I transformed-in all ways for the better- with bracing, mass and damping (all done with minimal effect on internal volume.