Cloud Electronics 46-120TMedia - Manual (Page 20)

46-120 Installation and User Guide V1.2 20
1 2 3 4
LINE
LEVEL 600 ohm
- +
1 2 3 4
600 ohm
To MOH input of
telephone system
MOH/Utility Output
OR
INDUCTION LOOP AMPLIFIER
LINE
LEVEL
Before using the MOH/Utility output with a telephone system,
it is recommended that the system manual is consulted to
check suitable audio levels and any other compatibility issues.
See page 23 for further details of the MOH/Utility output.
Auxiliary line outputs
In large zones, it may be necessary to use additional amplifiers
to obtain the necessary power to drive a greater number of
loudspeakers, or to drive some loudspeaker types requiring
high power levels than the 120 W available from the 46-120’s
channels. To permit the connection of further amplifiers (or
any other equipment), unbalanced outputs from the 46-120’s
pre-amplifier sections for Zones 1 and 2 are available at the
rear panel phono (RCA) connectors labelled
AUX OUT
Z1 & Z2.
All Zone1 and 2 controls and settings on the front and rear
panels (levels, source selection, priority settings, etc.) affect
the Auxiliary line outputs. However, note that their source is
pre the switchable 65 Hz high pass filters, thus any additional
amplifiers connected at the
AUX OUT outputs would need
to have hi-pass filters applied if they were being used to drive
100 V/70 V-line circuits.
Music Mute
External muting of music may be commanded through the
MUSIC MUTE connector. National or Local Authority
regulations governing installed audio systems may require
that normal programme material (i.e., music) should be muted
in an emergency, to ensure that any evacuation messages
are clearly audible. When active, it mutes the current music
source in all four zones, leaving the microphone inputs active.
The Music Mute input is on a 2-pin 5 mm-pitch screw-terminal
connector. It should be connected to the appropriate alarm
output on whichever building management system registers
the alarm (typically the Fire System). The alarm output must
be volt-free; if no such output is available, an intermediate
relay or other isolation device must be installed between the
alarm output and the Music Mute input.
The Mute input can be set to operate on either normally
open (N/O) or normally closed (N/C) contacts via internal
jumper J5 (see page 30). The factory default setting is N/O,
thus requiring a short-circuit to be applied across the two
pins of the connector for muting to occur.
NOTE: The rear panel line input sub-board and Facility Port
sub-board will need to be removed (undo M3 screws on rear
panel) to gain access to jumper J5.
1 2
MUSIC MUTE
INPUT
RE
LA
Y
NORMALLY OPEN (NO)
CONNECTION
Remote Power Down
The 46-120 may be powered-down remotely, typically from an
external control system. A 2-pin, 5 mm-pitch screw-terminal
connector,
REMOTE POWER DOWN ([17] at page 12)
is provided for this purpose. A short-circuit applied across the
pins will power the 46-120 down; thus wiring this connector
to the contacts of an external relay (typically one within a
control processor) is all that is required to implement this
feature. The short-circuit must be kept applied to maintain
the 46-120 in an OFF state; on removing the short-circuit, the
46-120 immediately powers-up again.