WIRELESS SYSTEM: RCEP R42 INTERCHANGEABLE WLESS MICROPHONE WITH TWO HANDHELD TRMS H60/OM5 OM5 has become one of the most respected portable dynamic microphones in the world. Used on stage, in studios and for broadcast applications, the OM5 has a reputation for clarity, resistance to feedback and the ability to handle SPL at over 144 dB without distortion.