Balanced line / mic inputs 1 & 2 (combination 6.3 mm jack & XLR):
Channels 1 and 2 are implemented using combination connectors accepting both XLR
and 6.3 mm jack plugs. The gain for these inputs is adjustable within a range of -6 dB
and -50 dB which can accept either microphone or line level signals. A priority switch on
top of both inputs will mute all other channels when a signal is present on the connected
microphones / inputs. Phantom power switches enable 15 Volts phantom power for pow-
ering condenser microphones when connected. Switch 1 will enable phantom power to
channel 1, while switch 2 enables phantom power to channels 2, 3 and 4 simultaneously.
Balanced line / mic inputs 3 & 4 (XLR):
Channels 3 and 4 are implemented using XLR connectors. The gain for these inputs is
adjustable within a range of -6 dB and -50 dB which can accept either microphone or
line level signals.
Unbalanced line / balanced mic inputs 5 & 6 (RCA & 6.3 mm jack):
Channels 5 and 6 are implemented using both RCA and 6.3 mm jack connections.
Selection can be made whether a stereo line input is connected using RCA connections
or a microphone is connected using 6.3 mm jack connections. The gain for the line (RCA)
input is adjustable within a range of +14 and -30 dB, while the gain for the mic (6.3 mm
jack) input is adjustable within a range of -6 and -50 dB.
Remote mic (Terminal block):
A remote paging microphone can be connected to this 4-pin terminal block connector
while the input sensitivity can be adjusted using the trim potentiometer located above it.
This remote microphone input has priority over other inputs. More details regarding pri-
orities are described in a further chapter of this manual. The balanced input microphone
connections should be made to the ‘H’ (Hot or Signal +), ‘C’ (Cold or Signal -) and ‘G’
(Ground) terminals. Using the ‘SW’ terminal, a pre-announcement chime will be played
when a contact closure is made with the ‘G’ (Ground) terminal.
Tele-paging (Terminal block):
The amplifier can be connected to any business telecom system using the tele-paging
input, allowing announcements to be made from any handset. It is a line level input with
priority, to be connected to the line output of the telecom system. Balanced input connec-
tions should be made to the ‘H’ (Hot or Signal +), ‘C’ (Cold or Signal -) and ‘G’ (Ground)
terminals.
System muting (except tele-paging) can be achieved by a contact closure between the
‘EXT MUTE’ contacts. This can be useful for overal system muting, in situations where
a fire-alarm or other priority system has a contact output for muting background music
systems.
Music on hold (Terminal block):
The music on hold connection allows the COM amplifiers being used in combination with
a business telephone system, having background music from an external source when the
call is placed on hold. The signal inserted on channel 6 (EXT MOH) will be available on this
output. The level can be adjusted using the trimmer located on top of it.
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