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Soundcraft EFX/EPM User Guide Issue 1210
GLOSSARY
Auxiliary send An output from the console comprising a mix of signals from channels derived
independently of the main stereo mix.
Balance The relative levels of the left and right channels of a stereo signal.
Balanced A method of audio connection which ‘balances’ the wanted signal between two
wires, these wires also have a screen which carries no signal. Any interference is
picked up equally by the two wires, which results in cancellation of the unwanted
signal. In this guide, the term can refer to various circuit architectures. Connection
details are given in relevant sections.
Clipping The onset of severe distortion in the signal path, usually caused by the peak signal
voltage being limited by the circuit’s power supply voltage.
DAT Digital Audio Tape, a cassette-based digital recording format.
dB (decibel) A ratio of two voltages or signal levels, expressed by the equation dB=20Log10
(V1/V2). Adding the sufx ‘u’ denotes the ratio is relative to 0.775V RMS.
DI(direct injection) The practice of connecting an electric musical instrument directly to the input of the
/DI Box mixing console, rather than to an amplier and loudspeaker which is covered by a
microphone feeding the console.
Equaliser A device that allows the boosting or cutting of selected bands of frequencies in the
signal path.
Fader A linear control providing level adjustment.
Feedback The `howling’ sound caused by bringing a microphone too close to a loudspeaker
driven from its amplied signal.
Foldback A feed sent back to the artistes via loudspeakers or headphones to enable them to
monitor the sounds they are producing.
Frequency response The variation in gain of a device with frequency.
Gain The amount of amplication in level of the signal.
Headroom The available signal range above the nominal level before clipping occurs.
Impedance balancing A technique used on unbalanced outputs to minimise the effect of hum and
interference when connecting to external balanced inputs.
Insert A break point in the signal path to allow the connection of external devices, for in-
stance signal processors or other mixers at line level signals. Nominal levels can be
anywhere between 0dBu to +6dBu, usually coming from a low impedance source.
Pan (pot) Abbreviation of ‘panorama’: controls the levels sent to left and right outputs.