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Remote Port (see
figure
9
This places the amplifier in standby mode.
The XPA U Full Rack Series amplifiers can enter standby mode (reduced power state) if they meet one of the
following two conditions:
1.
After 25 minutes (± 5 minutes) of inactivity (loss of signal)
2.
Upon activation of the REMOTE port
Defeating the Standby Timer
The standby timer can be disabled by wiring the supplied 10 kΩ resistor between the Standby and Ground pins. The amplifier can
still be forced into standby mode via the remote standby port, even if the inactivity timer is disabled.
The following truth table summarizes the behavior of the amplifier in the various scenarios:
Remote Port Action
No action (open)
Open to Close
Close to Open
No action (open)
Open to Close
Close to Open
Front Panel Features
1
Groove for inserting Grille removal tool
1
Channel Status LEDs
2
Power LED
3
Figure 5.
XPA U 2004 FX (top) and XPA U 2008 FX (bottom) Front Panels
Groove for inserting Grille removal tool — Insert the included plastic pry tool, flathead screwdriver, or other small flat
1
object into this groove and pull forward to remove the plastic Grille.
Channel Status LEDs — Four (XPA U 2004 FX) or eight (XPA U 2008 FX) pairs of LEDs provide feedback about the status of
2
each channel. They have the same function as the corresponding rear panel LEDs (see
The upper Limiter/Protect LEDs light red when the channel is in protection mode, triggered by any of the limiter protection
circuits:
Excessive clipping (providing sufficient warning before the transformer cores in a high impedance speaker system
•
saturate).
Short circuit on output
•
The lower Signal LEDs light green when the input signal crosses the signal detection threshold.
3) — Use the 3.5 mm 2-pole captive screw connector to connect the STANDBY pin to the G pin.
Inactivity Timer Defeated?
No
No
No
Yes
Yes
Yes
1
POWER
2
3 4
1
2
POWER
4
5
Time Since Last Detected Signal
Less than 25 minutes
Amplifier remains active
Amplifier enters standby
Amplifier becomes active
Timer restarts
Amplifier remains active
Amplifier enters standby
Amplifier becomes active
XPA U 2004 FX
2
3
4
LIMITER/
PROTECT
SIGNAL
OVER TEMP
5
XPA U 2008 FX
3
4
5
6
7
8
LIMITER/
PROTECT
SIGNAL
OVER TEMP
Over Temp LED
Removeable Plastic Grilles
More than 25 minutes
Amplifier enters standby
Amplifier remains in standby
Amplifier becomes active
Timer restarts
-
-
-
1
figure 3
on page 3)).
STANDBY
G
REMOTE
5
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