CX263 Installation and User Guide v1.1
14
Zone Outputs
In normal operation, the music level in each zone will be set by
the front panel
MUSIC LEVEL
control, or by a corresponding
control on a remote plate. Follow the procedure described
previously (“Gain & level” on page 12
) to adjust the music
level in each zone.
EQ
The various zones in a building often have different acoustic
properties, and may also have different models of loudspeaker
installed. The CX263 is fitted with HF and LF EQ adjustments
([6] on “Description of rear panel” on page 8
) for the
music signal at each zone output, to enable the audio
frequency response to be best matched to each zone. The
controls should be adjusted by listening; up to 10 dB of cut or
boost at 10 kHz (
HF) and 50 Hz (LF) is available. Note that
these EQ adjustments do not affect the frequency response
of microphones or paging.
Priorities
The CX263 offers several options for determining what
happens to music signals when announcements are made. The
options are selected via internal jumpers, and should be set
to suit the requirements of the installation when the system
is installed. See “PCB jumper location and settings” on page
19 for location of the internal jumpers.
Mic 1/Mic 2 priority
By default, fully automatic, voice operated priority is provided
for the microphone inputs. When either microphone is used,
all music signals will attenuate by approximately 30 dB; after
the announcement, the music signals will restore smoothly to
their former level, over a period of 3, 6 or 12 seconds.
The Mic 1/Mic 2 priority over music can be disabled on a
per-zone basis by setting J6 on the relevant zone sub-board to
the ‘OFF’ position. The release time may also be set on a per-
zone basis to 3 s or 6 s by moving J3, or to 12 s by removing J3
altogether. Note that the release time setting will apply to all
music ducking, regardless of which priority setting initiates it.
Line 6 priority
It may sometimes be necessary for one music input to have
priority over all the others; for example, a jukebox in a bar,
or a digital sound store programmed to make automatic
announcements in a public space. Line Input 6 may be set
to have priority in any or all zones over whichever source is
selected for the zone by its
SOURCE
control.
Line 6 priority can be enabled independently for each zone
by moving internal PCB jumpers J10a & J10b (Zone 1),
J8a & J8b (Zone 2) and J9a & J9b (Zone 3). Note that there are
two physical jumpers per zone. The jumpers should be set to
the ON position for Line 6 priority; the default setting is OFF.
When Line 6 priority is enabled, a signal present at the
LINE 6
input will force the zone’s source selection to that
input; when the signal disappears, the previously-selected
source will be gradually restored over a period of 3, 6 or
12 seconds, as selected by internal PCB jumper J3. Note that
the setting of J3 is applicable to all zones with the priority
enabled.
Microphone 1 priority
Microphone 1 input on the CX263 is automatically configured
to take priority over both the music signals and Microphone
2. When the priority circuit is triggered, signals at
MIC 2
input
are effectively muted. See the next section for details of the
effect on music signals in the zone.
Jumper positions:
•
AVO: the priority action is triggered when the access
contact for that zone is shorted to ground
and
a signal is
detected at the microphone input.
•
ACC: the priority action is triggered as soon as the
access contact for that zone is shorted to ground.
•
OFF: This position is not marked, but can be achieved by
removing the jumper altogether.
NOTE:
It is recommended that if removed, the jumpers are
stored on one pin of the PCB header in case the unit needs
to be reconfigured in the future.
Mic-over-Music priority
Both microphone inputs have priority over music signals.
When the priority circuit is triggered, music signals in the
respective zones are attenuated by 30 dB until the priority
circuitry is released.
Once priority has been released, the music signal will be smoothly
restored to its former level, over the time period defined by
the setting of J3 (see “Line 6 priority” on this page). Note
that J3 defines the time constant for both Line 6 priority and
Mic-over-Music priority.
A signal at
MIC 2
input will trigger this priority circuit under
all conditions. A signal at
MIC 1
input may trigger the priority
either via signal detection (AVO) or contact closure at the
rear panel access contacts (ACC). See the previous section
for details of how to configure the Mic 1 priority action.
If for any reason it is necessary to permanently disable the
Mic-over-Music priority in a particular zone, an internal
modification to the PCB can be made. Please refer to
the Technical Notes section of the Resources page at
www.cloud.co.uk
for details.
