Allenheath XONE 42 User Manual download pdf (Page 23)

Allen & Heath 23 XONE:42 User Guide

FILTER REFERENCE

The VCF Filters

A voltage controlled filter is an audio filter where the cut-off frequency is altered by a DC

control voltage rather than a variable resistor. This produces a much wider operating

range and more control over the filter response to create unlimited combinations of

tonal effect.

Filter Type Select

The filters are ‘state variable’. This means that they provide three simultaneous filter

types: high-pass, band-pass and low-pass. Three large illuminated switches select which

type is active. You can press any combination together to create different response types

such as ‘notch’ and an interesting ‘all-pass’ effect. The switches are ‘soft switched’ for live

performance, meaning that the audio signal is ramped between filter states to prevent

audible clicks.

Note that the last selected type is lost when power is removed from the console. The

LPF is always selected when power is applied.

The graphs below show the effect on the audio frequency response for the three filter

types. The range of sweep from low to high frequency is shown together with the effect

of adjusting RESONANCE (one frequency with several resonance settings shown).

The vertical scale shows the amount of cut or boost around the normal 0dB operating

level. The horizontal scale shows the change in frequency from low (bass) to high

(treble).

10k20 1kHz100 20k

0dB

+10

+15

+20

-5

-10

-15

-20

HI-PASS FILTER

BAND-PASS FILTER

10k20 1kHz100 20k

0dB

+10

+15

+20

-5

-10

-15

-20

10k20 1kHz100 20k

0dB

+10

+15

+20

-5

-10

-15

-20

LO-PASS FILTER

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Allenheath XONE 42 User Manual Page 23

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