AUSTRALIAN MONITOR ACM120XL Instrukcja obsługi - Strona 4
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Drukuj stronęVOX 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 a 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 0.5 amps at 100VAC.
VCA Control
An external pot (500 ohm to 1K) can be connected to the ACM120XL for remote control of the master level. While a 1K
pot can used, better results (smoother volume adjustment) can be obtained by using a 500 ohm pot. 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 ACM120XL 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.
Insert Point
The ACM120XL includes 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 ACM120XL. It allows for the "mixed" output of the ACM120XL to be processed externally and then returned to the
power amplifier section of the ACM120XL.
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 ACM120XL.
The tape output remains unprocessed.
Tape Output
The ACM120XL includes a tape recorder output with dual RCA connectors. Although the output signal is mono, dual
RCA's are provided to allow for easy connection to domestic or professional tape recorders.
The output level of the tape output is governed by the 8 input controls of the ACM120XL. The front panel master
control does not affect the tape output. In a practical situation, this allows for "on the fly" changes to the power amplifier
level (to turn the PA system up or down) without affecting the signal being recorded.