JTS power supply unit for 4 pin connectors, The JTS PS500 is very versatile unit suitable for powering microphones with 4 pin mini XLR connectors. There are two identical 4 pin mini XLR sockets and one normal XLR male output. Powered by a PP3 battery. The two inputs can be mixed. A switch provides provision for accepting line level sources via the existing 4 pin connectors.