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GLOSSARY
attenuate to reduce or make quieter. decrease the signal level
auxiliary (aux) send an output signal from the mixer to supplemental equipment that provide additional
capabilities. typically the feeds to the mix are implemented on rotary level controls. an aux
return on the mixer is intended to connect to the output of the supplemental equipment.
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 and a
screen which carries no signal. any interference is picked up equally by the two wires, which
results in cancellation of the unwanted signal.
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 suffix ‘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 amplifier and loudspeaker which is covered by a
microphone feeding the console.
direct output a post fade line level output from the input channel, bypassing the summing amplifiers, typically
for sending to individual tape tracks during recording.
equalizer 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
amplified 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 amplification in level of the signal.
headroom the available signal range above the nominal level before clipping occurs.
highpass filter a filter that rejects low frequencies and passes only high frequencies. the cut-off frequency
determines the limit that frequencies are rejected or allowed to pass through.
impedance balancing a technique used on unbalanced outputs to minimize the effect of hum and interference when
connecting to external balanced inputs.