- Sennheiser EW-D EM R4-9 - Digital 9.5" single channel receiver of the ew-D series, frequency range R4-9: 552?608 MHz, dimensions (WxHxD): 212 x 44 x 189 mm, weight: approx. 1 kg, incl. rack mounting set and antennas EUR 289.00 - See more - Buy online