Brooks QS - 95 CD (Compact Disc) :

1) Digital sound storage medium. Provides a high quality source of music, sound effects etc. Also used as a playback medium for sound effects etc. by large theatres with long running shows, although CDR (Recordable CD) is becoming more affordable by the day.
2) An abbreviation of the term Compact Disc (a small optical disk with digital audio recorded on it).

Far Field
The area from 3 feet away from the sound source up to the critical distance.

Brooks QS-70 Compression Driver
The unit that feeds a sound pressure wave into the throat of a horn (in a horn loudspeaker).

Electrostatic Charge
The excess or deficiency of electrons in a given area.

Brooks KM 22 IM Distortion
An abbreviation of the term Intermodulation Distortion (Distortion caused by one signal beating with another signal and producing frequencies that are both the sum and the difference of the original frequencies present).

Beat
1) The steady even pulse in music.
2) The action of two sounds or audio signals mixing together and causing regular rises &.falls in volume.

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.

Amplification
An increasing of signal strength.