Cloud CX163 Instrukcja instalacji i obsługi - Strona 12

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SETTING UP & OPERATION

Music Inputs

Gain & level
To avoid dramatic changes in volume when switching between
sources, the CX163's music inputs are provided with preset
gain trim controls ([2] on "Description of rear panel" on page
8). These vary the input sensitivity from -17.8 dBu to +6
dBu (approx. 100 mV to 1.5 V). When setting the system up,
play audio from all the sources in use and listen to them one
at a time in one of the zones (preferably the one in which the
mixer is located) at a reasonable volume. Taking a source of
"average" volume as the reference, the gain controls of the
others should be adjusted so that there is no appreciable
difference in volume between any of the sources. (With a
typical music source, setting the gain on its channel to mid-
way is a good starting point.) Note that consideration may
need to be given to the type of programme in use, particularly
if one or more sources are TV sound.
In normal operation, the music level in each zone is set
with the MUSIC LEVEL control on the front panel ([2]
on "Description of front panel" on page 7). This control
will not be operative if the corresponding internal jumper
J13 (Zone 1) or J12 (Zone 2) is set to DEF (see below).
When setting the audio system up, set the gain controls
(if any) on the power amplifiers for each zone to minimum,
then turn the MUSIC LEVEL control on the mixer to
maximum. Then increase the zone volume by turning up the
power amplifier gain until it is as loud as will be required in
normal use. This method ensures that excessive volumes will
not be possible with the mixer's operational controls.
Note that the setting of the MUSIC LEVEL control has no
effect on microphone or paging volume.

Local/remote control

If a zone has an RL-1 Series remote control plate connected,
the corresponding internal jumper - J13 (Zone 1) or
J12 (Zone 2) - may be set to DEF for the corresponding front
panel controls to be disabled. Zones without such plates
should have the jumper left at the default position of NRM.

Music EQ

Treble and bass equalisation for the music signal in Zone 1
and Zone 2 is provided via rear panel pre-set controls ([7]
at "Description of rear panel" on page 8). This allows the
installer to tailor the response of the Zone Mixer's music
channels to suit the acoustics and loudspeakers in each zone.
The EQ controls are marked HF and LF; the HF control has a
range of ±10 dB at 10 kHz and the LF control a range of ±10
dB at 50 Hz.
Note that a flat frequency response is achieved by positioning
the slots on the controls in the horizontal plane.
12
CX163 Installation and User Guide v1.1

Microphone Input

Phantom Power

The microphone input has 12 V phantom power available.
This will be adequate to power a wide range of condenser
microphones. (Some "studio quality" mics may require a
higher phantom voltage and thus necessitate an external
PSU.) To enable phantom power at the mic input, the internal
PCB jumper J5 should be moved to its ON position. See
"PCB jumper location and settings" on page 17 for jumper
locations.
Phantom power should NOT be enabled if dynamic
microphones are to be used.
Gain & level
The microphone input is provided with a rear panel preset
GAIN control ([4] at "Description of rear panel" on page
8). A wide range of gain is available (10 to 50 dB), and
there should be no problem in obtaining a satisfactory level
from any normal microphone.
The mic GAIN control should be adjusted by speaking
normally into a microphone of the correct type. Start with it
at minimum gain (fully anticlockwise), turn the corresponding
front panel MIC LEVEL control up to maximum and listen
in a convenient zone; the rear panel GAIN control should
then be carefully advanced until the mic volume is as loud
as it is ever likely to be needed, and then reduced slightly.
There should be no audible distortion. The use to which the
microphone is to be put should be borne in mind – karaoke
is more likely to overload the mic preamplifier than spoken
announcements, if the gain is not set correctly.
In normal operation, the mic level in each zone is set with
the MICROPHONE LEVEL controls on the front panel
([3] on "Description of front panel" on page 7).

Paging Access Control

On the CX163, the microphone input may be used for paging
purposes. Paging microphones from the Cloud PM Series (and
also the older CDPM Series) are fully compatible; OEM paging
microphones using the "contact-closure" (short-to-ground)
method of zone selection will also be suitable.
It should be noted that Cloud PM Series paging microphones
will need to be connected using the "analogue" interface; the
CX163 does not support the Cloud Digital Paging Interface
also implemented on these models. Note also that PM or
CDPM Series microphones cannot be powered from the
CX163; an external PSU will be required. Full details can be
found in the PM Series Installation Guide.