BNO Speakers: Phantom Power

1) When this is turned on in the soundboard it will power the active microphones in the system. It should be turned off when no active mics are hooked up.
2) 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.

Feedback
1) The delayed signal sent back to the input of a delay line, used in repeat-echo effects.
2) The pickup of the signal out of a channel by its input or the howling sound that this produces.
3) In an amplifier, the phase reversed output signal sent back to its input, reducing gain but also distortion and noise.
4) This occurs when the sound coming out of the speakers goes back into the microphones, then back out the speakers, then back into the mics�and so on. This can build very quickly to a point where everyone in the room is holding their ears and screaming at you. It can also cause damage to the PA.

Regulated Power Supply
A device to supply power to electronic equipment whose output voltage will not fluctuate when more equipment is turned on, or if there is a change in voltage of the power line.

RT
An abbreviation of Reverb Time (the time it takes for the reverberation or echoes of a sound source to decrease 60 dB, after the direct sound from the source stops).

Monitors
The speakers facing back onto the stage and the system or amps, equalizers, and effects attached to them.

Action
In guitar playing, action refers to how far the strings sit off of the guitar neck. When strings are close to the neck, it is referred to as "Low Action". When the string sit far above the neck, it is called "High Action". Guitars with low action are easier to play, but make sure they are not too close, or it could causing buzzing.

Amplitude
The height of a waveform above or below the zero line.