ALLEN & HEATH GLD User's Guide download pdf (Page 18)

Qu-16 User Guide 18 AP9031 iss.2

Frequency – Each band can sweep its centre point

frequency across the full range from 20Hz to 20kHz.

This means you can overlap bands and have more

precise control over problem frequency areas.

Width – Each band has a bell-shaped response. The

width of the bell can be varied from a very wide 1.5

octaves affecting many frequencies to a very narrow

1/9

octave affecting a small range of frequencies.

Setting LF or HF to widest position changes its

response to shelving.

Experiment with the controls to hear their affect on

different sounds. Switch the PEQ in or out using the In

key to compare the sound. It is better to cut rather than

boost frequencies where possible.

Compressor

The Compressor is a powerful tool for controlling the

dynamics of the sound, for example to smooth out a

bass guitar or to narrow the dynamic range of a vocal

to make it more intelligible in a busy mix. At its extreme

setting the compressor can be used as a limiter to

prevent the signal exceeding a preset maximum level.

A compressor works by dynamically reducing the

amount of gain when the signal increases above a

certain threshold. This pulls back loud moments.

Applying ‘make-up’ gain restores the average volume

and also has the effect of bringing up quiet moments.

The result is a reduced dynamic range.

While listening to the signal adjust Thres (threshold) to

set the point at which compression starts. The GR

indicator and red screen meter will start to show that

compression is active. Set Ratio for how much

compression you want from none (1:1) to full limiting

(Inf). A good starting point is around 3:1.

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.

Compressor active

GR = Gain Reduction

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ALLEN & HEATH GLD User's Guide Page 18

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