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Description

Phantom power, in the context of professional audio equipment, is DC electric power transmitted through microphone cables to operate microphones that contain active electronic circuitry. It is best known as a convenient power source for condenser microphones, though many active direct boxes also use it.

FAQ

Can voltage fluctuations in the phantom power (PP) cause microphone hiss?

It's very unlikely that voltage fluctuations in the phantom power (PP) could cause hiss.

What are the 3 pins for phantom power?

There are three pins. Phantom power is connected to both pin 2 and pin 3 (but as long as your cable is not broken, simply use it).

X stands for ground (it is connected to the cable shield).

Pin 1 (X) = ground
Pin 2 (L) = + most commonly, or Left
Pin 3 (R) = - most commonly, or Right

Will phantom power damage dynamic microphones?

The risk is higher if it is an unbalanced connection. The Sound Reinforcement Handbook by Yamaha says something like this:

"In a phantom power system, the polarizing supply voltage is placed on both of the signal lines in a balanced connection, with the same polarity on each line. Dynamic microphones connected in a balanced system with a phantom power input are then protected from damage, theoretically, since the system results in a net zero DC potential across the coil. However, a dynamic mic connected unbalanced to a phantom power input may be destroyed."

In other words if you take a sm57 and plug it into a phantom powered mic pre using a normal balanced mic cable then you should be safe.

If you take an unbalanced mic and wire it with a xlr plug so you can connect it to that same input then you could fry the mic. In a balanced connection the 48 volts is running parallel down the 2 signal wires. With an unbalanced connection (2 conductors) you have 1 signal wire and ground and doing this is basically completing a circuit that sends 48volts directly to the mics voice coil.

What are the correct steps connecting a mic to phantom power

So the steps when connecting are:

1. Turn down those master faders.
2. Plug in mic.
3. Turn Phantom Power on.

and when disconnecting:

1. Turn down those master faders.
2. Turn Phantom Power off.
3. Unplug mic.

Big Signal Hit from AKG 414 on Avalon 2022 from Phantom 48

anonymous 15 August 2008

Hello people, I am wondering from sometime now why when I turn on or off the phantom power on my Avalon 2022 for my AKG 414 BXL II it gives 2 or 3 signal hits for over +3 dbs, an then settles. They work great together, but always behaves the same manner after turning on/off its phantom +48 power. Is this normal, sometimes in the powering of the +48 signal says hello this way?.

Phantom Power Supply

Dozer 14 November 2007

Hello everyone, I am looking for a good, highly regulated, phantom power supply.
My Emu 1820M's phantom power supply is jacked up, FOR THE SECOND TIME. Bought the Emu, 7 months later, PREAMP PROBLEMS, I got a new on on warranty, 8 months later, same thing. Exact same problem. Now Im out of warranty, and the 1820M is discontinued. The Card is great, but damn them preamps.

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