Brooks Cinema RM 909 Amp

1) An abbreviation of the term Amplifier (A device which increases the level of an electrical signal.
2) An abbreviation of Ampere (the unit of current).
3) An abbreviation of amplitude (the height of a waveform above or below the zero line).

Channels
These are divided into two separate categories. Input channels are those channels coming into the soundboard such as microphones and direct lines. Output channels are those leaving the board such as monitor and main outputs.

Brooks VT-50 Clock Signal
The signal put out by a circuit that generates steady even pulses or steady codes used for synchronization.

Compression Ratio
How many dB the input signal has to rise above the threshold for every one dB more output of a compressor or limiter.

Brooks Cinema ZL 44 Impedance
1) A term for the electrical resistance found in a/c circuits. Affects the ability of a cable to transmit low level (e.g. sound) signals over a long distance. Measured in Ohms. Speakers are rated according to power handling capabilities (Watts, W) and impedance (Ohms).
2) The total opposition offered by an electric circuit to the flow of an alternating current of a single frequency. It is a combination of resistance and reactance and is measured in ohms. Remember that a speaker's impedance changes with frequency, it is not a constant value.
3) The opposition to alternating current.

Earth
The British version of the term Ground (In electronics, a place that has zero volts).

Jack Bay
A series of jacks which have connections for most of the inputs and outputs of the equipment in the control room.

Compact Disc, Interactive CDI
A Compact Disc, usually containing audio, video, and text, which the user can interact with in that the display or playback changes after the user performs some action.