ALLEN & HEATH GLD User's Guide download pdf (Page 22)

Qu Mixer User Guide 22 AP9372 iss.1

Use the In key to switch the compressor in and out

and turn up Gain so that the average volume is similar.

Attack sets how fast the compressor starts to work

when the threshold is reached. Release sets how fast

it stops compressing when the signal drops below the

threshold. For example, adjust these to achieve a

‘punchy’ dynamic sound, or smooth out the response

to reduce an audible ‘pumping’ effect.

Two ‘knee’ settings are available. Hard Knee means

that compression is applied at the set ratio as soon as

the threshold is reached. Soft Knee means that the

compression ratio increases gradually from 1:1 to the

set ratio as it approaches the threshold. The curve

illustrates this.

4 Compressor types are available using the drop-

down menu. Two ‘Manual’ types allow user control of

attack and release. Two ‘Auto’ types provide automatic

control of the compressor dynamics.

Experiment with the effect of the compressor settings

on different sounds. Try to use compression only

where it is needed, and avoid compression in stage

monitor speakers.

Mix processing

The mix masters provide PEQ, GEQ, Compressor, FX

Insert capability and output Delay.

Insert switches an internal FX in or out if one has been

patched into the mix. The button is disabled when the

insert is not patched. The FX is inserted at the start of

the processing before the EQ.

Use the FX / Back panel screen to choose and assign

one of the 4 internal FX as an Insert into a mix.

Delay up to 170ms can be added to each mix output.

This is typically used to time align the PA to the

acoustic sound from the instruments on stage, or to

align fill loudspeakers to the main PA. Allow 1ms per

foot distance as a starting point.

GEQ (graphic equaliser)

The Graphic EQ is a popular tool for tuning out

resonant frequencies in PA systems, for example when

ringing out monitor speakers.

The GEQ allows tonal adjustment of the overall mix

sound. It splits the 20Hz to 20kHz audio frequency

range into 28 standard 1/3 octave bands from 31.5Hz

to 16kHz allowing +/-12dB cut or boost.

Touch the screen In button to switch the GEQ in or

out. Touch a slider to highlight it and use the screen

rotary to cut or boost its frequency. This affects a

small range of frequencies 1/3 octave wide centred on

the frequency marked below the slider. The position of

the sliders shows the approximate shape of the

resulting frequency response curve.

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ALLEN & HEATH GLD User's Guide Page 22

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