Speaker Output Terminal Strip
Located at the top left of the rear panel is the speaker output terminal strip. Reading from left to right, the
connections are:
COM
Common or “-” for low impedance speaker loads (4 or 8 ohms).
4
Positive “+” for 4 ohm speaker loads (use with common)
8
Positive “+” for 8 ohm speaker loads (use with common)
COM
Common or “-” for 70v or 100v speaker loads (maximum load of 40 ohms at 70v)
25
Positive “+” for 25v line speaker loads (use with common)
70
Positive “+” for 70v line speaker loads (use with common)
Please ensure that the correct “Common” is used. Low impedance and 70/100v loads can be used
simultaneously but please pay careful attention to the overall speaker load. When used individually, the low
impedance load should be 4 ohms or higher while the 70v line load should not fall below 40 ohms. When
both outputs are used simultaneously, ensure that neither output is loaded to maximum.
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 on any of the priority inputs. This would normally be inputs 1, 2 and 3 however
some or all of 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, 2 and 3 having priority so assuming
that this has not been changed, then signal from 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 AMIS120XL 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.
Tone Generator
The AMIS120XL includes a 4 tone generator module featuring Alert, Evacuate,
Pre-Announce and Bell
tones. All 4 tones can be activated individually using the rear panel terminal strip. Shorting “Common” to
the relevant tone name will activate that particular tone.
The volume level of the tone is set via an internal pot (R63) which is located to the far right (when looking
from the front) of the front mixer PCB. The pot is labelled R63 and sets the level of all 4 tones. Please note
that the level of the tones is not affected by the “Master” control on the front panel.
When any of the 4 tones are activated, inputs 4 to 8 are muted. Inputs 1, 2 and 3 on the other hand will mix
with the tones and can be used at the same time.