Phantom power is a commonly used power supply method in professional audio systems. The difference between it and the general power supply is: the conventional power supply mode, the power supply is for the power supply line and the signal is for the dedicated signal line; and when using the phantom power supply, it does not need to use the dedicated power line. The energy provided by phantom power is transmitted through the audio signal line, and the audio signal at the same time. So, phantom power supply and conventional power supply, the number of cables required, and the connection with the device are different. The phantom power supply voltage is +48V (more common), +24V, +18V, +12V, etc. The specific height is determined by the power supply equipment. Normally phantom power does not provide too much energy, and it is only suitable for low power consumption equipment.