Allenheath GLD-112 Reference Guide User Manual download pdf (Page 25)

GLD Touch Screen Reference V1.4 – Issue 1 25 ALLEN&HEATH

and relies on manual sweeping of the phase chain using

the ‘offset’ control.

Offset - Shifts the operating frequency range of the Phaser.

Maximum settings force the Phaser to operate in higher

frequencies. Lower Offset settings allow lower frequency

phase sweeps (more intense). In manual mode (Depth = 0)

the user can adjust the phase sound with this control.

Preset Name is displayed. Touch and scroll using the

screen Rotary for live update. This is a way of live

auditioning all library presets for this module (factory, user

and USB). You can also select and recall a particular preset

using the Library window.

Hypabass

A sub-harmonic synthesis unit used in the live sound

environment to generate infra and sub bass spectrum from

weaker bass programme. We initially emulated the

American analog classic, but implementation in DSP gave

us the ability to use more sophisticated techniques in the

sub harmonic generator and filtering stages. The result is

reduced distortion in the infra bass section and much better

independent control of the infra and sub bass spectrum,

essential for live PA use.

The module is stereo in stereo out (with software

normalised mono input if source is mono). The stereo

signal remains stereo throughout the signal path. There is

no mono’ing to produce either the infra or sub bass path.

• BEWARE - Extreme care is needed. Driving high infra

bass levels into insufficient speakers may lead to speaker

equipment damage.

Operation

‘Hypabass’ is a sub harmonic synthesis module. An LF

input de-emphasis/emphasis trim stage feeds the sub

harmonic generator creating low distortion, low frequency

spectrum below the source input spectrum. This sub

harmonic spectrum is then band-split into Infra Bass (18-

36Hz) and Sub Bass (36 Hz upwards). This allows Infra and

Sub bass to have separate level controls, essential for

controlling ‘Infra Bass’ and ‘Sub Bass’ preventing speaker

equipment damage, and dealing with resonant acoustics or

speaker resonance with exotic LF cabinet porting. Separate

Infra Bass and Sub Bass meters are provided. Each are

peak detected from both Left and Right signal paths and

presented on one meter.

UPPER FREQ CUT - Controls the upper bandwidth of the

sub bass harmonic spectrum. This setting depends greatly

on the sub bass speaker equipment and the original bass

content. Typically a low setting is common to prevent the

generated sub bass upper harmonics clashing with the

original bass content. Beyond mid position is only useful for

Lost Fundamental mode.

LF INPUT BOOST - This filter stage provides emphasis on

the input spectrum into the sub harmonic generator and

can be used as a global ‘more or less’ control once

everything else is setup.

INFRA BASS Mode - This is the default mode. Energy in

the Infra and Sub bass spectral regions is synthesised from

the input bass content. Using the independent level

controls the engineer can balance Infra and Sub bass.

• Avoid infra bass damaging equipment or sub bass

resonating. UPPER FREQ CUT needs to be kept low to

prevent the generated sub bass upper harmonics clashing

with the original bass content.

LOST FUNDAMENTAL Mode - These harmonics can be

output to a mid-range driver to create apparent bass energy

since these upper harmonics are musically related to the

original bass content. Useful for increasing bass perception

in music driving mid-range speaker systems. This turns the

Infra bass section off and modifies the output spectrum to

operate in the typical upper bass region. Using the Sub

level and UPPER FREQ CUT the engineer can manipulate

the output to contain harmonics that are above the input

bass spectrum.

Preset Name is displayed. Touch and scroll using the

screen Rotary for live update. This is a way of live

auditioning all library presets for this module (factory, user

and USB). You can also select and recall a particular preset

using the Library window.

Empty Rack

The GLD RackFX is a 'virtual outboard effects rack' with 8

slots. These can be loaded with different types of effects

units or left empty.

To load an effect – Touch the Library button and select an

FX type and preset from the lists. You can choose to view

the built-in Factory or User presets, or those found on a

USB key when plugged in. Touch Recall to load the FX unit.

To remove an effect – Touch the Library button and select

‘Empty Rack’ from the list. Touch Recall. The current FX will

be removed and the rack slot left empty.

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Allenheath GLD-112 Reference Guide User Manual Page 25

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