WASHINGTON, DC – The Federal Communication Commission (FCC) approved a change in its regulation that now permits operation of Wireless Multichannel Audio Systems (WMAS) in the U.S. Both Shure and Sennheiser applauded the approval, which promises the ability to transmit more audio channels within a limited block of radio frequency (RF) spectrum along with greater interference protection to other wireless services that share the same spectrum.
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https://fohonline.com/featured/sennheiser-applauds-fcc-report-order-on-wmas-approval/