>According to the Radio Shack 1998 catalog, the Optimus PRO-50MX >response is 20-20,000Hz. The paper work with my Pro-50MX says 10-22000Hz Mike...NO6X Check out my home page at http://home.inreach.com/no6x -- CQ-Contest on WWW: http://www.contesting.com/_cq-contest/ Administrative requests: cq-contest-REQUEST at contesting.com