Theoretically, a baffle so large that sounds originating on either side of it never reach the opposite side. A practical example would be a speaker mounted in an opening in a wall.
"CVC productions was a perfect match for our special need for audio production. We had some old recordings that we needed to rescue and put in the most modern formats available, with complete sound enhancement. CVC was extremely competent in their work and fair in their dealings with us. The audio CD's sound great. I don't know how we would ever ..."