Brooks QS - 95 Fundamental

The tuned frequency and (almost always) the lowest frequency that is present in the sounding of a pitch by a musical instrument.

Impedance Matching
Having or converting the output impedance of a device so that it matches the impedance of the input it will feed.

Brooks QS-70 Ground
In electronics, a place (terminal) that has zero volts.

Cable, XLR
A balanced cable used for low impedance microphones and sometimes for connections between some parts of the PA. Commonly referred to as a "mic cord".

Brooks Cinema GT 845 I/O
Short for "Input/Output' and referring to:
1) An in-line console module that contains controls for the input section, output section and monitor section.
2) A module in electronic gear containing input and output amplifiers for the device.
3) A digital port (connector) able to both receive digital data and output digital data.

Electrons
Negatively charged particles, which revolve around the centre of atoms. The movement of such electrons down a conductor causes electrical current.

Echo Send
The output of a console used to send a signal to an echo chamber or delay effects device.

Gain
1) Knob usually found at the top of each input channel on the soundboard. Used to set input levels of the separate channels to relatively equal positions.
2) The amount of increase in audio signal strength, often expressed in dB.