Give the performances youve always wanted to. Get precise and accurate in ear monitoring with an LD Systems U508 IEM In Ear Monitoring Receiver. Your sound couldnt be clearer. With a signal to noise ratio of over 95 dB and total harmonic distortion under 0.3% you can expect superb detail from any good sound source. You can also save yourself hours across gigs. The receiver and separately sold compatible receivers synchronise in seconds using in-built infrared technology.