Brooks Cinema ZL 44 Keyboard Controller

A device that has the standard music keys of piano but puts out MIDI signals

Efficiency
The acoustic power delivered for a given electrical input. Often expressed as decibels/watt/meter (dB/w/m). ESL �" Abbreviation for electrostatic loudspeaker.

BROOKS AUDIO reviews Level
Sets output volume of individual PA input channels. Usually positioned as sliders at the bottom of the soundboard.

Acoustic Echo Chamber
A room designed with very hard, non-parallel surfaces and equipped with a speaker and microphone; dry signals from the console are fed to the speaker and the microphone will have a reverberation of these signals that can be mixed in with the dry signals at the console.

Brooks Cinema QS - 95 Haas Effect
Simply stated, a factor in human hearing where delay has a much bigger effect on human perception of direction than level does.

Chamber
1) An Echo Chamber (a room designed with very hard, non-parallel surfaces equipped with a speaker and microphone so that when dry signals from the console are fed to the speaker, the microphone will have a reverberation of these signals that can be mixed in with the dry signals at the console).
2) A program in a delay/reverb effects device that simulates the sound of an Echo Chamber.

Boost
To increase gain, especially to increase gain at specific frequencies with an equalizer.

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