Parasound HCA-1201A - Manual (Page 7)

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Remote DC Trigger Connection
The Remote DC Trigger allows you to control the internal speaker relay with an external DC voltage
source so you can remotely activate the speaker relay to allow the output of the amplifier pass to the
speakers. The trigger circuit can be activated with an external DC source that ranges between + 9 Vdc
to +12 Vdc. To properly terminate the DC trigger cable for the HCA-1201A, first determine the + DC
voltage and ground conductor from the external DC source. For example, the Parasound AVC-2500 has
a DC trigger that incorporates a two-conductor 1/8" mini connector. The tip of this connector is positive
and the ring is negative (ground). In this case, you would terminate one end with an 1/8" mini plug and
the other end with an RCA jack. The tip of the RCA jack of the HCA-1201A is also positive and the sleeve
is negative. Once you have terminated the DC trigger cable, connect the RCA connector to the jack
labeled Remote In on the HCA-1201A and the other end to the external DC trigger source.
Remote DC Trigger On-Off switch
When you are using the DC trigger circuitry, set the Remote switch to the On position. If you are not using
the DC trigger circuit, set the switch to the Off position. Important note: The output relay will not let the
signal pass to the speakers if this switch in in the on position and no DC voltage is present.
Daisy Chaining DC trigger Connections
You can "daisy chain" the DC trigger output to activate additional HCA-1201A amplifiers. Connect the
Remote Out on the first HCA-1201A to the Remote In on the second HCA-1201A, and so on.
AC Power Connections and AC Grounding
Before you connect the AC cords, make sure the HCA-1201A's power switch is in the off or down
position. If possible, plug your amplifier directly into an AC wall outlet. Do not connect the AC cord to
the accessory AC outlet on your preamplifier because the amplifier's current draw exceeds the ratings of
most preamplifier’s power switches and power cords. If you use an external AC line conditioner, make
sure it can withstand the HCA-1201A's power requirements listed in the specification section of this
manual.