ALLEN & HEATH GLD Digital Audio Mixing System User's Guide download pdf (Page 9)

GLD Touch Screen Reference V1.2 – Issue 1 9 ALLEN&HEATH

Trim can provide +/-24dB ‘gain’ control when the source

does not have a preamp, for example input from GLD

surface RCA line inputs, the I/O Port or USB playback. Trim

is part of the channel, not the preamp.

When working with mic preamps it is typical to leave Trim

set to 0dB unless you are gain sharing and want to adjust

local level independent of preamp Gain.

Polarity toggles normal and reverse (+/- balanced input

pins swapped). Use to compensate for reverse wired

cables, or when double miking sources such as a snare

drum with ‘top’ and ‘bottom’ mics, or kick drum with ‘in’ and

‘out’ mics. Polarity is part of the channel, not the preamp.

HPF – The High Pass Filter cuts low frequencies, for

example to reduce pops or wind noise on microphones or

tune out unwanted low end on acoustic instruments.

The HPF provides a 12dB/octave slope with cut-off

frequency adjustable from 20Hz to 2kHz. The filter can be

switched in or out of circuit. A good starting point for vocal

mics is to switch the HPF in and set to around 120Hz.

The HPF can also be viewed and adjusted in the PEQ page.

Screen Sel buttons – These do the same as their related

surface Processing Strip Sel keys:

 Use with the Copy/Paste/Reset keys

 Hold to listen to (PFL) the signal at that point if the

‘Disable PFL on Sel’ option is set to Off in the Setup /

Audio / PAFL screen.

3.7 Preamp Option - Gain/Trim on Surface

The Preamp Option lets you choose whether the

Processing Strip Gain rotary controls the Preamp Gain or

channel Trim.

Preamp on Surface – The surface Preamp rotary adjusts

Preamp Gain. This is the default for normal single console

operation.

Trim on Surface – The surface Preamp rotary adjusts

Channel Trim. Consider using this in situations where you

are sharing the same Preamp between channels or FOH

and Monitor consoles.

OPTIONS pull-up window

Provides a global setting for Preamp or Trim on Surface.

This affects all input channels.

Touch the pull-up tab and swipe your finger upwards to

open its window.

A note about Gain Sharing

Any Preamp can be patched to any Channel. The same

Preamp can be patched to more than one channel. For

example:

 One set of channels within the GLD allocated to the

FOH mix and another split from the same mic inputs for

important channels feeding the monitor mixes.

 Mic preamps split between dedicated FOH and Monitor

consoles using a digital snake connected to the GLD I/O

Port.

In the above cases the Preamp is shared by two channels.

The ‘Master’ console has control of the preamps and mic

Gain. The ‘Slave’ console gets its inputs from the digital

split. Its surface Preamp rotary becomes Channel Trim as it

does not have mic preamps. However, it will be affected by

preamp Gain changes made at the Master.

It is of course best that the FOH and Monitor engineer each

have independent control of channel gain.

A solution is to set the Preamp Gain during sound check

and for both engineers to use the Trim rather than Gain

controls during the show. This means setting the ‘Trim on

Surface’ option on the ‘Master’ console.

3.8 Mix Ext In source

You can assign a source as an external input to the mix, for

example for bus summing, combining console outputs, or

an external communications or test source.

The Ext Input sums with the GLD mix pre-insert and is

affected by the master processing and fader.

Source Select – Open the drop-down menu to choose

which source to patch to the mix output. Touch Apply to

accept or Cancel to leave unchanged.

Trim - Provides +/-24dB level control. This only affects the

Ext Input. Start with Trim set to 0dB.

Polarity - Toggles normal and reverse (+/- balanced input

pins swapped). This only affects the Ext Input to the mix,

not the mix.

Socket Preamp – If the patched source is a Mic/Line XLR

input then its Preamp controls are shown. These provide

remote control of the input preamp circuit located at the

socket.

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ALLEN & HEATH GLD Digital Audio Mixing System User's Guide Page 9

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