At lower audio frequencies (sidetone set in the 400/500 hz range) I hear a mechanical buzz or fuzzy sound. I've checked the mounting and all seems very tight. I'm wondering if perhaps the speaker cone is defective? Any hints or advise you can offer is appreciated. Thanks, Bill W7WEL - (K2 #4001) --- [SMGazette.com E-mail is scanned for viruses by Declude Virus] [Visit us on the web at SMGazette.com]