Brooks XM 204 reviews Attack

The rate the sound begins and increases in volume.

Crossover, Passive
Used inside of full range speaker cabinets to separate highs, mids, and lows and send them to their respective speakers within the each cabinet. These are not as efficient as active crossovers because they require all frequencies to draw from the same source of amplification.

Brooks Speakers reviews Attenuation
A making smaller: reduction of electrical or acoustic signal strength.

FOH (Front of House)
Refers to the speakers that face toward the audience. Also called the "main" speakers.

BROOKS AUDIO DESIGN reviews Cut-Off Frequency (Turnover Frequency)
1) The highest or lowest frequency in the pass band of a filter.
2) The highest or lowest frequency passed by an audio device (the cut-off frequency is usually considered to be the first frequency to be 3 dB lower than a reference frequency in the middle of the bandwidth of the device)

Close Micing
A technique of placing a microphone close to the sound source (within one foot) in order to pick up mainly the direct sound and to avoid picking up leakage or ambience.

Fade
1) A gradual reduction of the level of the audio signal.
2) A gradual change of level from one pre-set level to another.

Audio
Most often referring to electrical signals resulting from the sound pressure wave being converted into electrical energy.