Some condenser microphones require a power supply in order to operate. If this supply is not from a battery within the microphone body, it is known as a phantom power supply. It is usually 48 Volts DC (can be 9 - 52 volts from most mics), and is supplied either by a separate battery pack, or by the sound desk. The supply is termed "phantom" because it is "invisibly" carried down the same microphone cable as the sound signals. PHASES
In the CCITT BRI standard, the ability of the NT1 to provide power to the TE1/TA over the transmit and receive power pair.
The method of providing external power to a condensor mic. DC voltage of identical polarity is applied to the two signal leads of the XLR connector (pins 2 & 3). Voltage of the opposite polarity is applied to the ground (pin 1). This means that there is no voltage differential on the signal leads to generate noise.