Line Inputs
All four inputs are dual mic/line with line/auxiliary inputs being via dual RCA connectors per channel. Line
inputs 1, 2 & 3 have an input sensitivity of 150mV @ 100K ohms. Input 4 has an input sensitivity of
300mV @ 220K ohms making it suitable for high level inputs such as a CD player. Reading from left to
right across the rear panel, the inputs are 4, 3, 2, & 1.
Insert Point
The AMIS60 & AMIS120 include an Insert Point to allow for connection of signal processors such as
equalisers, compressors or Feedback Exterminators. The Insert Point is located (electronically) between the
mixer and power amplifier sections of the AMIS60 &AMIS120. It allows for the “mixed” output of the
amplifier to be processed externally and then returned to the power amplifier section of the AMIS60 &
AMIS120.
The Insert Point is a 3 conductor (Tip, Ring, Sleeve) socket which accepts a standard stereo 6.35mm (1/4”)
jack. The one jack allows for signals to be “sent” to the processor and then “returned” to the power
amplifier. The connections are:
Tip
Amplifier in. This is the return signal from the processor
Ring
Mix Output. This is the signal from the mixer stage which is to be sent to the processor
Sleeve
This is the ground connection
When an external processor is used via the insert point, it only affects the power amplifier section of the
AMIS60 &AMIS120. The tape output remains unprocessed
VOX Relay Output
The terminal strip to the immediate right of the AC inlet features a relay output. This relay is activated
when signal is present at any of the priority inputs. This would normally be inputs 1 and 2 however, these
channels can be removed from the priority bus via internal links (see “Muting” further on in this manual).
The unit is shipped from the factory with inputs 1 and 2 having priority so assuming that this has not been
changed, signal at any of these inputs will activate the VOX relay circuit.
The relay outputs are C (Common), NO (Normally Open) and NC (Normally Closed). The NO or NC
selection provides the installer with the option of the relay either opening or closing a contact. This feature
is normally used in conjunction with relay override attenuators (volume controls). In this application, the
relay output could trigger an accessory power supply which in turn bypasses the remote attenuators. The
result is that priority inputs will always be heard irrespective of the attenuator setting. The relay contacts
are 3 amps at 125VAC/30VDC.
VCA Control
An external pot (500K) can be connected to the AMIS60/120 for remote control of the master level. The
external pot is governed by the master level of the amplifier allowing the installer to set the volume, then
lock the amplifier in a rack, leaving the user with just a master volume control that cannot go beyond the
level set on the master (front panel) control. Connection is via a 2 wire terminal strip on the rear panel of
the amplifier.