impedance load should be 4 ohms or higher while the 100v line load should not fall below 80 ohms. When
both outputs are used simultaneously, ensure that neither output is loaded to maximum.
Spare
Tone Generator Common
(use with one of the 4 tones listed below)
Pre-Announce Chime
Alert Tone
Bell Chime
Evacuation Tone
24 volt DC
Vox Relay Out
VCA
Note:
The minimum impedance (or maximum load) at 100 volt line should be no less than 80 Ohms for
the ACM120 and no less than 160 Ohms for the AMIS60.
Speaker (Zone) Output Terminal Strip
Reading from left to right, these screw terminal pairs correspond to the switched 70 volt line outputs and
are numbered 6 through 1 as indicated on the front panel of the amplifier. For each pair, the left hand
terminal is the 100 volt output and the right hand terminal is the common.
Phantom Power Button
This button enables or disables the 15 volts DC phantom power which is available on all microphone inputs
(XLR’s). The “in” position indicates that phantom power is ‘on’ for all mics. The “out” position means that
phantom power is switched ‘off’ for all mics. Phantom power is required for electret condenser
microphones that require DC power to operate. While some of these microphones can operate from an
internal battery, having phantom power available on the amplifier eliminates the need to regularly change
batteries in the microphone. While phantom power is not required for the more common Dynamic
microphones, it will not damage them providing they are balanced. Do not plug an unbalanced microphone
in to any amplifier or mixer when phantom power is switched ‘on’.
Line Output
The balanced XLR line level output provides a maximum of 700mV to allow for the connection of
up to 6
power amplifiers. Simply run a balanced cable from the line out of the AMIS60 or AMIS120 to the line
input of the power amplifier. Pin connections are:
pin #1
-earth;
pin #2
-signal (high, +);
pin #3
-signal (low,
-).
Tape Output
Dual RCA output connectors provide a line level output with a maximum of 350mV into 10K Ohms which
is ideal for connection to most standard tape recorders. This output is sourced before the master gain
control and as such, the tape output level is not influenced by the operation of the master gain control.
Microphone Inputs
All four inputs are dual mic/line with microphone inputs being via a 3 pin XLR connector per channel. The
mic input sensitivity is 1mV @ 200 ohms. Pin connections are:
pin #1
-earth;
pin #2
-signal (high, +);
pin
#3
-signal (low, -). Phantom power of +15 volts is available on all microphone inputs. Reading from left to
right across the rear panel, the inputs are 4, 3, 2, & 1.