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Allen & Heath 16 XONE:DB4 User Guide
THE EQ SECTION
1
2
3
4
HF CONTROL
Adjusts the high frequency
content of the channel audio. In
ISO or EQ mode the centre-
detent position will give a flat
frequency response, fully
clockwise will boost the high
frequencies by 6dB, and
anticlockwise will attenuate them.
In FILTER mode this control
becomes a low-pass filter, and
must be rotated fully clockwise
for a flat frequency response.
Rotating anticlockwise will
progressively lower the cut-off
frequency of the filter.
1
MF/RES CONTROL
Adjusts the mid range frequency
content of the channel audio. In ISO
or EQ mode the centre-detent
position will give a flat frequency
response, fully clockwise will boost the
mid frequencies by 6dB, and
anticlockwise will attenuate them.
In FILTER mode this control sets the
sharpness (Q) or resonance of the two
filters. Rotate fully anticlockwise for
low resonance, and fully clockwise for
high resonance. Use this control with
care as a high resonance will boost the
signal level at the Filter cut-off point
which could cause the signal to clip.
2
LF CONTROL
Adjusts the low frequency content of the channel
audio. In ISO or EQ mode the centre-detent position
will give a flat frequency response, fully clockwise will
boost the low frequencies by 6dB, and anticlockwise
will attenuate them.
In FILTER mode this control becomes a high-pass
filter, and must be rotated fully anticlockwise for a flat
frequency response. Rotating clockwise will
progressively raise the cut-off frequency of the filter.
3
MODE SELECT SWITCH
Use to select the desired EQ mode. As each mode
is selected the illuminated pointer on the control
knobs will change colour:
All Blue in ISOLATOR mode
All Red in EQ Mode
Two Blue, one Red (RES control) in FILTER mode
4
The music channel EQ Section on the XONE:DB4 can operate in one of three different modes. Each
mode is indicated by the colour of the illuminated control knob pointers.
ISOLATOR MODE
In this mode, the EQ provides full attenuation when fully anti-clockwise and a safe +6dB of boost when
fully clockwise. This EQ offers a steep 24dB/octave slope for tight frequency isolation. In isolator mode
the EQ knob pointers are illuminated BLUE.
EQ MODE
In this mode, the EQ provides –26dB of attenuation and +6dB of boost. This EQ has a gentler 12dB/
octave slope better suited to certain styles of music. In EQ mode the knob pointers are illuminated RED.
FILTER MODE
In FILTER MODE, the EQ section becomes a high and low pass filter system with adjustable resonance,
offering precise control over the frequency spectrum. The filters haver a 12dB/octave slope. The HF and
LF knob pointers illuminate BLUE, and the MF RED. The MF pot controls the resonance, or
“sharpness” (Q) of the filter.
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