Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <CTCDW-at-aol-dot-com> Indeed, the use of a "tuned" cylinder for the JL to occupy has been mentioned on the list before. You would want one that resonates at 60hZ, since most of us don't have high frequency JLs. It merely amplifies the 60hZ buzz. Chris W