ALC-1809 LOUDSPEAKER CONTROLLER
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ALC REAR PANEL
2.2 - USB PORT
Connect the ALC to your computer at this port using the supplied mini USB cable. Microsoft Windows 10 will
discover the ALC unit and install the required drivers. When doing this for the first time, this process may take a
few minutes. On subsequent connections, Windows will install the driver more quickly. Refer to “ALC Program-
ming” section of this manual for more information.
As of this writing operating systems other than Windows are
not supported.
2.3 - 12V/CONTACT CLOSURE TRIGGER INPUT
The STANDBY/OPERATE TRIGGER will operate with applied DC voltage or with an open/short circuit. With
the Main Power Switch in the ON position, connect a 12VDC trigger output, or contact closure relay to this jack
using the supplied “Euro” or “Phoenix” connector.
When connecting to a control system relay/contact closure output, program the relay to close (short) the termi-
nals to engage STANDBY; open the terminals for OPERATE.
When connecting to a DC trigger output, make sure to observe correct voltage polarity. Some third-party
12VDC trigger outputs have sufficiently high output impedance that the ALC trigger input cannot “sense” the
attached device, so the ALC will not go into STANDBY. In this case, install the supplied 41k-ohm Trigger Resistor
Accessory provided with the ALC unit in the trigger “LOOP” output position, leaving the 12V trigger output from
your preamp connected to the trigger “INPUT”. This resistor will pull the ALC into STANDBY; when the preamp
12VDC trigger outputs 12V, the ALC will awake and operate normally.
TRIGGER RESISTOR ACCESSORY
Failure to observe correct trigger polarity could result in damage to the ALC input or your component trigger
output.
0VDC will engage STANDBY mode; 5VDC up to 12VDC will cause the ALC to come out of STANDBY
MODE and OPERATE.
2.4 - 12V/CONTACT CLOSURE LOOPING OUTPUT
Use this jack to “loop” the Trigger input signal to another ALC chassis using the supplied 2-position Euro con-
nector block. When using a DC trigger input, make sure to observe correct polarity, or component damage
may occur. If you need the supplied 41k-ohm resistor accessory to pull the ALC into standby with your 12V
triggering device connected, install the LOOP wires together with the resistor into the Euro block plugged into
“LOOP” output.
