A
B
G
C
D
E
F
UNDERSTANDING THE INDICATORS ON THE A 23
AC Present Indication
When the A 23 is plugged into a live AC outlet, a soft blue halo glows behind its
On-Off
button
and its red “P” Badge glows faintly. These indicate that the unit is plugged into a live AC outlet,
even when it is turned off.
On and Off Indications for Both Manual and Automatic Modes
When the A 23 is first turned on, the soft blue glow behind the
On-Off
button turns red for about
five seconds and then becomes a brighter blue.
Channel Status Indicators
These are two small round indicators in the center of the recess in the front panel. The indicator
on the left displays the status of the left channel and the indicator on the right displays the status
of the right channel.
No Illumination:
When the A 23 is turned off, these indicators are off.
Blue Illumination of Channel Status Indicator:
When both channels are operating normally, these both glow blue.
No Illumination of Channel Status Indicators:
A blue channel indicator will stop glowing if there is a fault in its corresponding amplifier
channel. If this occurs for either channel, the halo glow behind the On-Off button will also
change from blue to red.
High-Temp Indicator
This indicator is near the right side of the panel recess. It will glow red if either channel overheats.
Level Controls
We recommend that you rotate the
Left and Right Level
controls to their maximum clockwise
positions, marked
THX Reference.
Refer to
Level Controls
in
Technically Speaking
for more
information about setting level controls.
Ground Switch
The
Ground
switch can assist in reducing audible hum caused by ground loops in your system.
Leave this switch in its
Normal
(down) position unless you hear hum through your speakers (you’ll
only be able to hear this hum after your entire system is installed and operating). You can try the
Lift
(up) position to eliminate it. Please refer to the
Technically Speaking
section for detailed
technical information about the causes of ground loops and what you can do about them.
10
C
A
D
H
I
B
F
E
G
3
C A U T I O N
H
I
H
50
