ALLEN&HEATH 14 AP11645_1_XONE:96 User Guide
XONE:VCF REFERENCE
The XONE:VCF Voltage Controlled Filter
A Voltage Controlled Filter is an audio filter where the cut-off frequency is altered by DC control voltage rather
than a variable resistor. This produces a much wider operating range and enables more control over the filter
response for creating unlimited combinations of tonal effect.
Two stereo VCFs are provided, one either side of the crossfader, each with independent Filter Type Select (HPF,
BPF, LPF), FREQuency sweep, RESonance and CRUNCH controls. These large soft touch controls are
positioned either side of the crossfader and main mix channels 1 - 4 for convenient live operation.
Filter Type Select
The filters are ‘state variable’. This means they provide three simultaneous filter response output types:
High-Pass (HPF), Band-Pass (BPF) and Low-Pass (LPF). Three large illuminated switches select which type is
active. Any combination can be pressed together to create different response types such as ‘notch’ and
interesting ‘all-pass’ effects. Pressing one switch automatically deselects the previously active type.
All XONE:VCF switch controls implement fully redesigned analogue soft-switching for enhanced performance
ensuring LR MIX outputs are unaffected by audible electronic artefacts as FILTER 1 and FILTER 2 are turned ON
or OFF, when selecting different Filter Types, or if channel assignments to the VCFs are hot-switched.
• NOTE: the last selected XONE:VCF response is saved when mains power to the mixer is turned OFF.
The graphs to the left illustrate effects 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 the RES
control fully clockwise, to WILD.
The vertical scale shows the amount of boost
around the normal 0dB operating level.
The horizontal scale shows the change in
frequency from low (sub-bass) to high (treble).
The graph below shows effects on frequency
response for the Low Pass Filter [LPF] swept to
@20Hz, 1kHz and 20kHz, together with the effect
of adjusting the filter resonance to MILD, WILD and
centred positions: one frequency with RES and
FREQ set to minimum, 12 o’clock, and max.
LOW PASS FILTER [LPF]
HIGH PASS FILTER [HPF]
BAND PASS FILTER [BPF]
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General
Weight and Dimensions
