Dynamic and passive ribbon microphones do not need phantom power?

For musicians who prefer to use dynamic microphones or passive ribbon microphones for sound pickup, there is a prejudice when choosing a sound card, thinking that the sound card does not have a phantom power supply and it is harmless. After all, the tools to help them eat are dynamic or Microphones with passive aluminum tape capsules do not need 48V phantom power to power them at all, so this prejudice has accumulated.

In fact, although it is said that dynamic microphones or passive ribbon microphones will not use the 48V power supply on the sound card, the microphones with standing microphones generally require 48V power supply. From this perspective, when buying a sound card, it is still standard. The choice of 48V power supply is more ideal.

For dynamic microphones and passive ribbon microphones themselves, 48V phantom power is a redundant function. But for their net gain amplifiers, they can have 48V power supply, which is not superfluous from another angle. Net gain microphone amplifiers are generally used for dynamic microphones and passive ribbon microphones. The microphone amplifiers themselves need to be powered by 48V phantom power to work normally, but the 48V power supply will not be supplied to the microphones. It is this feature that makes this type of speech. The amplifier is very suitable for the use of ribbon microphones and dynamic microphones. In addition, the sensitivity of this type of microphone is basically around -55DB. For this type of microphone, we need a speech amplifier with a gain of 55DB or more.

This type of microphone is generally divided into single-channel and dual-channel, and dual-channel microphone amplifiers are often also suitable for stereo dynamic microphones and passive ribbon microphones. Among them, part of the net gain amplifier also has the characteristic of adjustable impedance. Commonly seen entry-level sound cards or mic preamps not only have insufficient gain range, but while increasing gain, low noise is also significantly increased; on the contrary, net gain mic preamps can achieve dynamic coil without increasing low noise. And passive ribbon microphones provide +25DB (or plus or minus 12DB) net gain, making the output signal more clear and natural.

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