Sennheiser EW-DX EM 2 Two-Channel Digital Rackmount Receiver - Q1-9: 470 to 550 MHzThe Sennheiser EW DX EM 2 is a half rack, dual channel digital wireless receiver compatible with EW DX SK bodypack, EW DX SKM handheld, and EW DX TS tabletop transmitters. Housed in a rugged, all metal chassis built to withstand the rigors of professional use, it can either sit on a tabletop or be rackmounted (with the included rackmount set) for portable rigs and permanent A V installs. The wide 80 MHz tuning range, intelligent switching diversity,