ALLEN & HEATH XONE:23C User's Guide download pdf (Page 15)

15

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 provide two simultaneous filter types: high-pass, and low-pass. Large

illuminated switches select which type is active.

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

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

of adjusting RESONANCE.

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

+5

+10

+15

+20

-5

-10

-15

-20

HI-PASS FILTER

LO

HI

10k20 1kHz100 20k

0dB

+5

+10

+15

+20

-5

-10

-15

-20

LO-PASS FILTER

LO

HI

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 26 27

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