Brooks QS 70 FOH (Front of House)

Refers to the speakers that face toward the audience. Also called the "main" speakers.

Echo Return
An input of the console, which brings back the echo (reverberation) signal from the echo chamber or other echo effects device.

Brooks Speakers Cycles Per Second
A unit used in the measure of frequency, equivalent to Hertz. Cycles Per Second is an outdated term replaced by Hertz in 1948.

Ground
In electronics, a place (terminal) that has zero volts.

Brooks Cinema ZL 44 Coax
Two-conductor cable consisting of one conductor surrounded by a shield.

Buss (Bus)
A wire carrying signals to some place, usually fed from several sources.

Amplifier (Power amp, Head)
It's the part of the sound system that actually magnifies or "amplifies" the sound. In other words, it makes stuff louder.

Effects
1) Various ways an audio signal can be modified by adding something to the signal to change the sound.
2) Short for the term Sound Effects (sounds other than dialogue, narration or music like door closings, wind, etc. added to film or video shots).