Looking for a source for wool felt for my new speaker build. Found this company Zorro felt. They have a wide variety described by thickness and density. I may choose 1/8 inch low density to line the walls and a light amount of natural wool in the greater box volume carefull to not restrict the port. Will double or triple a layer of felt and attach to the back of the magnet and tweeter housing. The cabinet has no 90 degree angles inside or out and is cast granite with the area around the woofer 1.75 inches thick. Any suggestions are welcome .Tom