AUDIO TELEX ACM120R User manual

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Receiver Amplifier'
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ACMI 20RC
Receiver, Cassette Amplifier
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Audio Tefex Communications Pty Ltd
ACN 001345482 lncorporated in NSW
NSW & ACT QLD & NT
149 Beaconsfield Street
Private Bag 149
Silverwater NSW 2128
Australia
Ph 02 9il7141'l
FaxO2 9648 3698
42 CommercialRoad
PO Box 87't
Fortitude Valley QLD 4006
Ph 07 38s21312
Fax [phone]
221277 Middleborough Road
Box HillVlC 3128
PO Box 151
Blackburn South VIC 3130
Ph 03 98907477
Fax [phone]
299 Fitzgerald Street
West Perth WA 6005
PO Box 404
North Perth WA 6906
Ph 08 92284222
Fax [phone]
Electronic Concepts Pty Ltd
76 George Street
Thebarton SA 5031
PO Box 7034 Hutt Street
Adelaide SA 5000
Ph 08 8234944'a
Fax [phone]
K W McCulloch Pty Ltd
54a Albert Road
MoonahTAS 7009
Ph 03 62286373
Fax [phone]
New Zealand
Unit B, 11 Piermark Drive
PO Box 512
Albany NZ 1331
Ph 09 4159426
Fax [phone]

ACMI 20R Receiver Amplifier
ACM1 20RC Receiver/Cassette Amplifier
Product Description
The ACM120R is a 120 watt,4 channel (dual mic/line) mixer amplifier that has been optioned with an AM/FM radio receiver.
Similarly, the ACMI2ORC is optioned with an AM/FM radio receiver and cassette player. The ACM120R and ACM129RC operate
from 240 VAC, 50 Hz (or I l0 VAC with factory modification) and may be desk or rack mounted (via an optional rack mognt kit).
Both the ACM120R and ACM12ORC will deliver 120 watts into loads of 4 or 8 ohms, 70 or 100 volt line. Boih amplifiers include a 6
zone, 100 volt line speaker zone select feature complete with all-call. The maximum recommended load of the ACMI29R and
ACMI20RC on the 100 volt line output is 80 ohms.
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(ACM120RC shown. The ACMI20R does not include a cassette deck but is otherwise identical)
Front Panel Controls
Dual Microphone/Line Gain: The 4 dual mic/line input controls are labelled Chl .... Ch4 and should be adjusted to provide
the required mix level for each individual channel. Start with the controls set to Level 0 and turn the controls clockwise until the
desired mix level for each channel is reached.
BaSS TOnal COntfOl: Setting this control in the centre position will give an overall flat bass response to the output of the
amplifier. Adjusting the bass control in a clockwise direction will provide up to 12 dB of bass boost @ 100 Hz. Adjusting the bass
control in a counter-clockwise direction will provide up to 12 dB of bass cut @ 100 Hz.
Tfeble Tonal Contfol: Setting this control in the centre position will give an overall flat feble response to the output of the
amplifier' Adjusting the treble control in a clockwise direction will provide up to 9 dB of treble boost @ lOK Hz. Adjustinglhe treble
control in a counter-clockwise direction will provide up to 9 dB of treble cut @ lOK Hz.
MaStef OUtpUt This controls the overall output level of the amplifier depending on the levels set for the individual input mix
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
Page Chime Button: This allows the user to disable or enable the Pre-Announce Chime. This switch does not however
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 fage
Chime switch on the front panel of the amplifier allows the user to disable the chime function for those occasions when it is not
wanted.
All Call ButtOn: When pressed, this grey button will connect the 100 volt output of the amplifier to all 6 of the switched outputs
of the amplifier. Depressing this button again will disconnect the switched output. This switch is push-on, push-off and is non
interlocking.
Speaker SeleCtOf: These 6 black buttons are for switching the 100 volt line 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 zones is loaded

down for more than 60 watts, always remembering that the total amplifier load is 120 watts. It is possible to safely have one zone set
for 60 watts and the other 5 zones set for 12 watts for example.
POWef Switch: This switch controls the switching of AC power to the amplifier. When in the on position, the red LED to the left
of the switch will glow.
AM/FM ReCeiVefl The receiver includes a gain control which operates identically to the mic/line gain controls described on the
previous page (although it is completely independent ofthe controls described above). The gain control incorporated in to the receiver
controls the input level to the amplifier for both the receiver and the cassette player (if installed). When installed and activated, the
cassette player will override the receiver so that only one ofthe receiver or cassette player may be operated at once, the cassette player
having priority.
You may monitor the output of the receiver via an internal monitor speaker. The volume of the monitor speaker is controlled by the
vedical slider control labelled Monitor, located centrally on the front panel of the amplifier. If you want to preview the output of the
receiver before sending it out live to the speakers, simply tum the amplifiers master output level control fully anti-clockwise to tum off
the output of the amplifier. Note that if you do this, all output is tumed off, including all microphone inputs.
Five tuning bands are available, 2 x AM and 3 x FM: the receivers display panel will illuminate to display the relevant information. To
select the desired band, press the button marked AM/FM. Each time this button is pressed a different tuning band will be indicated on
the display panel. Up to 30 preset channels may be stored, 6 for each tuning band. To store a channel operate the up and down arrow
buttons until you locate and are properly tuned to the radio station of your choice. Then, press the memory button which will cause the
channel to flash on the display panel. Press the desired storage channel (numbered I to 6). The radio station chosen is then stored in
that memory location. You may automatically search for radio stations by operating the up and down arrow buttons. The receiver will
search for and automatically lock on to threshold signals in the frequency band you have selected. Continue to press the up or down
arrow buttons to resume your search or to fine tune any station selected.
Cassette Player (ACM120RC Only): The cassette player has 3 unique controls, one each for Eject, Rewind (REW) and
Fast Forward (FF). In addition, there is a gain control located on the receiver module that controls the output level ofthe cassette deck
(and, when a cassette is inserted, has priority over the receiver as detailed above). The cassette player may be monitored and
previewed in exactly the same fashion as the receiver.
The cassette player will begin playing immediately a cassette is inserted though the slot in front of the cassette player. The REW and
FF buttons will shuttle the cassette backwards or forwards respectively. Pressing both the REW and FF buttons together will reverse
the playing direction ofthe cassette player and effectively change the side ofthe cassette being played. Pressing the eject button will
eject the cassette and switch back to the receivers output. If you do not want to switah immediately back to the receivers output when
you eject the cassette, make sure that the gain control on the receiver is turned fully counter clockwise.
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Rear Panel Connections
3 Pin IEC AC Mains Power lnlet. The operating voltage is 240 VAC @ 50 Hz or tl0 vAC @ 60 Hz. The AC power
voltage level is not extemally user adjustable but is factory pre-set. The inlet is equipped with an inbuilt AC fuse holder fitted with a 4
Amp fuse plus a spare. Power consumption is 225 VA. I Please ensure that the mains power cord is disconnected before
attempting to check or replace this fuse.
Direct Output Terminal Strip: The screw terminals on the left hand side of the strip allow access to the direct speaker
outputs of the amplifier. The screw terminals on the right hand side are for activation of the in-built 4 tone generator. Reading from
left to right the terminals are:
. Low Impedance Common (use with 4 or 8 ohms)

o 4 Ohms
. 8 Ohms
r Constant Voltage Common (use with 70v or l00v)
o 70 Volt Line
o 100 Volt Line
o Spare
o Tone Generator Common (use with one of the 4 tones listed below)
o Pre-Announce Chime
o Alert Tone
. Bell Chime
o Evacuation Tone
Note: The minimum impedance (or maximum load) at 100 Volt line should be no less than 80 Ohms.
Switched Outputs Terminal Strip: Reading from left to right, these screw terminal pairs correspond to the switched 100
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.
Receiver Antenna Connectiofl. As described above, the receiver can tune to both the AM and FM bands. The FM band
has dual 75 and 300 ohm impedance capability. For best FM results, we recommend using the 75 ohm connection to a remote antenna
via 75 ohm coaxial cable.
Tape OUtpUt. This is a mono dual RCA type output and will provide an output of 350 mV in to a 10K ohm load. This output is
sourced before the master gain control and as such, the tape output level is not influenced by the operation ofthe master gain control.
Active Balanced, XLR Sockets For The Microphone lnputs. The mic input sensitiviry is lmv @ 200 ohms.
Pin connections are: pin #l-earth; pin #2-signal (high, +); pin #3-signal (low, -). Phantom power of +18 volts is available on all
microphone inputs. Reading from left to right across the rear panel, the connection are for microphone inputs 4, 3,2, & I respectively.
RCA Sockets For The Monaural Line Level lnputs. Line inputs 1,2 &3 have an input sensitivity of 75mV @47K
ohms. Input 4 has an input sensitivity of 300mV @ 47K ohms making it suitable for high level inputs such as a CD player. Reading
from left to right across the rear panel, the connections are for inputs 4, 3,2, &, I respectively.
Other Features
TOng GgngfatOfS: Four separate tones are available from the in-built tone generator board. All four tones can be activated
individually via a contact closure connected to the screw terminals on the rear of the amplifier. To activate the bell chime for example,
just run a pair of wires from the Tone generator cornmon and the Bell terminal to an extemal switch. Activating the switch, or closing
the pair of wires, will activate the bell. When any tone is activated, all inputs (except for inputs one and two) will automatically mute.
To adjust the level of the tone generator, disconnect the power lead, remove the amplifrer lid and locate the pot labeled R6. (located
behind the Bass adjustment pot). This pot adjusts the level for all 4 tones.
Tones available on the ACMI20R and ACMI20RC include:
o Evacuation Tone (to Australian Standard A52220.1.2)
o Alert Tone (to Australian Standard A52220.1.2)
o Bell Tone
o Pre Announce Chime
MUting: A VOX muting card is installed in the ACM120R and ACMI20RC. This feature provides automatic muting of some
channels when others are active. It is normally used so that a paging microphone can have priority (by muting) over background
music. VOX muting is available from channels I and 2 meaning that any signal on channels 1 and2 (mic or line) will mute channels 3
& 4. The muted channels will automatically ramp back up to normal volume when the signal on channels I and/or 2 is no longer
active. The amplifier ships with the VOX muting function enabled. To disable the VOX muting, disconnect the mains power lead
and remove the lid of the amplifier. Looking down from the front of the amplifier, a three position jumper (labeled JP2) is located just
to the left and behind the level pot for channel l. To disable VOX muting, move the jumper to the middle and left pins. (Factory
setting for VOX enabled is the jumper on the middle and right pins).
Accessories:
ACMRRK: 19" rack mount kit
Fuse Sizes:
Mains ACMI20R/RC, 240 V ACi 4 Amperes Slow Blow