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This device monitors audio activity over a wide range of input voltages and operates a DPDT relay. It may be used to detect voltages as low as that directly from a microphone, or as high as from a 70V speaker system. Inputs include: Mic level, 600ohm line level, 25V and 70V distributed speaker level. A low level, transformer isolated, 600ohm output is also made available for use with other equipment, allowing this to be used as a balanced, low impedance microphone preamp.