At the 2017 NAMM Show, held from January 19-22 in Anaheim, California, audio specialist Sennheiser will be launching new frequency variants of its evolution wireless ew 300 G3 and ew 500 G3 radio microphones. The new models have been designed to anticipate forthcoming changes in spectrum allocation in the USA and Canada, with the wireless microphone and monitoring systems now available in an A1 variant that covers the 470 to 516 MHz range.