Thanks for the replies. I wanted to get a feeling for the factors involved as one of my DB's came alive with Corellis after removing Spirocore Weichs. I just got the opposite result on another bass. This will help my selections in the future.
By the way, I really appreciate reading Ken's DB comments over the last months. I take his advice seriously as I'm aware of his knowledge and talents. Ken built me a top of line 5 string bass guitar in the late 1980's while I was living in Massachusetts. He was the first guy to get the low 'B' string on BG's correct. I've owned a lot of high-end BG's, including a Fodera, but none were as well made as Ken's, regardless of price. It was a piece of art. Nice article on Ken's company in Bass Player a while back too...it made me appreciate even more what he knows about fine instruments and woods.