Treble Control
Setting this control in the centre position will give an overall flat treble response. Adjusting
the treble
control in a clockwise direction will provide up to 9 dB of treble boost @ 10kHz. Adjusting the treble
control in a counter-clockwise direction will provide up to -9 dB of treble cut @ 10 kHz. It is recommended
to start with the treble control at the centre ‘0’ position and adjust if necessary.
Master Output Control
The master level pot controls the overall output level of the amplifier depending on the levels set for the
individual input channels as detailed above. Start with the control set to level ‘0’ and turn clockwise until
the desired output level of the amplifier is reached. The Master Output Control can also be operated via
remote VCA (see rear panel description)
Page Chime Enable Button
This allows the user to disable or enable the Pre-Announce Chime. This switch does
not activate the chime.
Activation is accomplished via the rear panel barrier strip (normally wired to a paging microphone). If the
pre-announce chime is connected to a paging microphone (meaning that it would be activated by the switch
on the microphone), the Page Chime Enable switch on the front panel of the amplifier allows the user to
disable the chime function on those occasions when it is not require
All Call Button
When pressed, the All Call button will connect the 70 volt output of the amplifier to all 6 of the switched
outputs (if connected). Depressing this button again will disconnect the switched outputs. This switch is
“push on-push off” and is non-interlocking.
Speaker (Zone) Selector Switches
These 6 black buttons are for switching the 70 volt output of the amplifier to any combination of the 6
available speaker zones. The switches are “push on-push off” and are non-interlocking (both with each
other and with the all-call button). The maximum capacity of each speaker zone is 60 watts so care should
be taken to ensure that no individual zone is loaded down with any more than 60 watts, always
remembering that the total load for the AMIS60 is 60 watts and for the AMIS120, 120 watts in total. Eg; it
is possible on the AMIS120 to safely have one zone loaded with 60 watts and the remaining five loaded
with 12 watts each.
Power Switch
This switch controls the switching of AC power to the amplifier. Rocking this switch upwards
turns ‘on’
AC power to the amplifier while rocking the switch downwards turns power ‘off’ to the amplifier. A blue
LED above the switch will indicate whether the amplifier is switched ‘on’ or ‘off’. This will not switch DC
power ‘on’ or ‘off’ in DC operation. In DC operation mode, the amplifier is always ‘on’.