Operation; Switching On; Mode Switches - Arcam HDA PA720 Handbook

Operation

Switching On

The POWER button switches the unit on and off. The
status indicator LED indicates the state of the amplifier:
it changes from red to orange then white if mains
power is connected and the unit is switched on.
Pressing the STBY button while the unit is powered
on, will place the PA720, PA240 or PA410 into standby
mode. Press the STBY button again to bring the unit out
of standby.
Automatic Standby
In order to comply with international regulations for
consumer products, this unit is designed to enter
standby mode if no user interaction and no audio input
signal are detected for an extended period of time
(default is 20 minutes). The unit can be brought out of
standby by pressing the STBY button on the front panel,
the trigger input or RS232 or ethernet command (if
enabled, see "Network and RS322 in Standby" for more
information)
The standby time out can be adjusted using either
RS232 or IP control commands. Please refer to the
PA720 / PA240 / PA410 RS232/IP control document,
available for download from www.arcam.co.uk.
Alternatively pressing and holding the MUTE button for
more than 3 seconds will toggle the standby time out
between OFF and 20 minutes.
Note: if the standby time-out is set to OFF, the automatic
standby feature will be disabled.
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Network and RS322 in Standby
In low power standby mode the network and RS322
functionality is disabled.
To enable network and RS232 in standby, send a control
or status request command to the unit whilst it is
powered on.
This will enable whichever control method was used
when the unit is in standby.
Note: To indicate the unit is not in lowest power standby
mode the LED will flash briefly when entering standby
mode.
Note: Enabling network or RS232 control will increase
standby power consumption. To restore the unit to
the default low power standby consumption press and
hold the STBY button for more than 3 seconds or restore the unit to
factory defaults.
Muting the Output
The speaker outputs of the PA720, PA240 or PA410 can
be silenced by pressing the MUTE button on either the
front panel or by sending the relevent command via
either the RS232 or network connection.
If the unit is muted, front panel power indicator will
change to orange.
To cancel the mute, press the MUTE button again or
send the relevent command via either the RS232 or
network connection.
EN-12

Mode switches

The various mode switches located on the rear of the
PA720 and PA240 amplifiers allow you to configure your
power amplifier to your specific equipment setup. See
"Connecting Sources and Loudspeakers" on page EN-13
for more information.
INPUT (PA720 and PA240 only)
This switch selects between the XLR and RCA phono
inputs of the amplifier. Select which ever connection
method you are using to connect your preamp.
GAIN(PA240 only)
This switch allows the gain to be changed from standard
Arcam gain of 31dB (which matches all Arcam amplifiers
and receivers) to 26dB. This allows flexibility to connect
multiple PA240 amplifiers in different modes to multiple
speakers.
In normal set-ups this switch should be left at 31dB.
MODE (PA240 only)
This switch selects between the different amplification
modes of the PA240.
STEREO (ST)
This is the standard stereo amplification mode using
two separate preamp inputs driving two separate
speaker outputs.
DUAL MONO (DM)
This mode allows two separate speakers to be driven
from a single preamp input.
Alternatively the two drivers of a single speaker can be
bi-amped from a single PA240.
BRIDGED MONO (BRIDGE)
This mode uses both channels of the PA240 to drive a
single speaker. This the ultimate in high power, high
fidelity amplification.
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