I know, I really should do my homework on HornResp. Your responses always point me back to the basics: crunch the numbers, build the prototype, measure, modify, and measure again. Beyond running McBean sims, I'm not yet ready for the remainder.The 10Pi must have been a storage shed! Might we please see some history on it? How does one go about avoiding standing waves, and do they occur more readily in a conical horn because of its symmetry?