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Rear Panel Bridged Mono Switch
Select Mono (up) or Stereo (down) as marked on the rear panel. The main power should be switched off
before moving this switch. If you accidentally leave the Mono Bridge switch in the Mono (up) position,
you will find stereo output will be weak and distorted.
Bridged Mono Speaker Connection
In the bridged mono mode, connect the speaker to only the left red positive terminal and the right red
positive terminal. In the bridged mode the right channel’s red terminal becomes positive, and the left
channel’s red terminal becomes negative. Do not use either of the black negative terminals. You may also
use a single standard 3/4" (19 mm) dual banana plug for the mono bridge connection to the two inner red
positive terminals.
AC Power Connections and AC Grounding
Before you connect the AC cord, make sure you amplifier's power switch is in the off position and the
external DC trigger is off. If possible, plug your amplifier directly to an AC wall outlet. Do not connect
the amplifier to the accessory AC outlet on your preamplifier or processor 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 or surge suppressor, make sure it can withstand the current draw of the amplifier.
DC Trigger Connection
This connector provides a way to trigger your amplifier on with an external DC voltage source ranging
from + 9 Vdc to +12 Vdc. With the main power switch on the off (down) position, the amplifier can be
turned on with voltage from any external DC source such as the +12 Vdc trigger from the Parasound
P/SP-1500. Since it is optically coupled, the DC trigger only requires 15 mA of current to activate the
circuitry and turn on the amplifier.
Operating Your HCA-1500A
Power Switch
Manual Turn On
Press the upper side to turn the unit on manually; press the lower side to turn the unit off.
Automatic Turn On
When the power switch is in the off position, the power amplifier can be turned on with an external DC
voltage applied at the DC trigger connector on the rear panel. (See above)
AC Line LED
The AC line LED on the front panel of your amplifier will illuminate whenever AC is present at the AC
connector. This LED indicates that the AC cord is connected and power is applied to the amplifier.