The Federal Communications Commission (FCC) issued a $7,000 forfeiture against Sennheiser Electronic Corporation for willful and repeated violation of Section 302(b) of the Communications Act of 1934; the apparent violation involves Sennheiser's marketing of unauthorized radio frequency devices.In July 2008, the Enforcement Bureau Spectrum Enforcement Division began an investigation into Sennheiser's marketing of wireless microphones. In a letter of inquiry dated August 15, 2008, the Division instructed Sennheiser to provide specific information regarding the manufacture, marketing, and the certification status of the wireless microphone systems it sells. In its September 15, 2008, response to the letter of inquiry, Sennheiser indicates that, while preparing its response, it discovered that one of its wireless microphones did not have a valid certification.Readers can view the FCC notice by clicking here.