Cloud Electronics 46-120TMedia - Manual (Page 23)

46-120 Installation and User Guide V1.2 23
system. This permits announcements to be made from some
(or any) internal telephone extensions in a building. Not
all telephone systems are suitable for this application, and
the system documentation should be consulted in detail to
ensure compatibility.
Internal jumpers J17A, J17B and J17C need to be moved
for this application. See page 30 for further information
regarding the internal jumpers.
This inserts a transformer
in series with the input connector to provide full electrical
isolation from the telephone system. Note that the mic input
sensitivity is decreased by 10 dB when the transformer is
enabled, and this results in the mic gain control operating
over the range 0 dB to 40 dB.
The audio (or “paging”) output of the phone system should
be connected to the
MIC 1/TEL input in the normal way. The
telephone input is optimised for connection to a 600 ohm
output; this should suit the majority of telephone systems.
Note that the front panel
MIC 1 LEVEL controls [3] are
still operational.
Zone and MOH/Utility 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 or module (or other
control system). The music level at the Utility/MOH output
will be set by the rear panel
MOH/UTILITY MUSIC
LEVEL preset control.
EQ
The various zones in a building often have different acoustic
properties, and may also have different models of loudspeaker
installed. The 46-120 is fitted with per-zone HF and LF EQ
adjustments for the music signal ([5] on page 11) to enable
the audio frequency response to be best matched to each
zone’s acoustics. 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 the microphone signal.
After the EQ has been adjusted during system commissioning,
the EQ presets may be made inaccessible by fitting the
security cover (one supplied with each Mixer Amplifier). See
page 29 for fitting instructions.
MOH/Utility output settings
The MOH/UTILITY output of the 46-120 can be used
for various purposes: a common application is to drive
loudspeakers (using additional power amplifiers) in secondary
areas such as corridors, lobbies or toilets, where there is no
necessity to make frequent alterations to the music source
or level.
Eight source options are available for the signal at the MOH/
Utility output, selected by internal jumper J16. This jumper is
in the form of a 2x8-way header, with a link being positioned
on one pair of pins only. The options are:
• The output is always fed with the music signal connected
to any one of LINE 1 to LINE 6. When in use with a
telephone system as an MOH source, it is generally more
desirable for the music source to remain constant; these
options are available for this purpose.
• The output always follows the music source selection
made for Zone 1 (either on the front panel or via remote
control). The
MUSIC LEVEL control for Zone 1 does
not affect the level at the MOH/Utility output. This option
is the factory default setting.
• The output is always fed with the output of the media
player. The rear panel LINE 1/MEDIA switch setting is not
relevant, and the media player may be used simultaneously
as Music Source 1, or not, as wished. This option is only
operative on models 46-120
MEDIA and 46-120T MEDIA .
See page 30 for locations and settings of PCB jumpers.
The signal at the MOH/UTILITY output may be any
required mix of the selected music signal and the microphone
signal connected at the
MIC 1/TEL input, and is set using the
rear panel presets MOH/UTILITY MIC 1 LEVEL control
and MUSIC LEVEL (see [15] at page 12). Each signal is
effectively ‘off’ with the preset control in its fully anticlockwise
position. Note that the signal at this output is NOT altered by
any front panel
MUSIC LEVEL or MIC LEVEL controls,
or any front panel MUSIC EQ preset adjustments.
The MOH/UTILITY MIC 1 LEVEL control
should be turned fully down if the output is to be
used for MOH with a telephone system, otherwise
paging announcements will be heard by telephone
callers.
If Zone 1 is selected as the MOH/Utility source (the factory
default setting), and Line 6 Priority is enabled (see page 24),
the MOH/Utility output will switch to Line 6 along with
Zone 1 output if the input becomes active.
High-pass filters
When the 46-120 is used to drive 70/100 V-line loudspeaker
systems via internally-fitted CXL-46T transformers (as in the
46-120T and 46-120T
MEDIA ), there is a risk of transformer
saturation at high levels and low frequencies. To prevent
this, each of the 46-120’s four channels is provided with a
switchable 65 Hz high-pass filter. These should be enabled for
any channels being used to drive 70/100 V-line systems.
The filters are enabled by moving internal PCB jumpers J3
(Zone 1), J4 (Zone 2), J8 (Zone 3) and/or J9 (Zone 4). See
page 30 for locations of PCB jumpers.
In models 46-120T and 46-120T
MEDIA , the jumpers are set at
the factory in the ‘ON’ position (filters enabled) for all zones.