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Operation
This section discusses how to operate the XPA Ultra Series full-rack audio power amplifiers.
Topics covered include:
•
•
•
•
Front Panel Features and Operation
A
B
C
Figure 5.
A
B
Front Panel Features and Operation
Rear Panel Features and Operation
Operation
Troubleshooting
A
Groove for inserting Grille removal tool
Channel Status LEDs
Power LED
on page 9
Front Panels for XPA U 2004 FX (top) and XPA U 2008 FX (bottom)
Groove for inserting Grille removal tool — Insert the included plastic pry tool, flathead
screwdriver, or other small flat 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 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.
XPA U 2004 FX
1
2
3
4
LIMITER/
PROTECT
SIGNAL
POWER
OVER TEMP
B
C D
E
XPA U 2008 FX
1
2
3
4
5
6
7
8
LIMITER/
PROTECT
SIGNAL
POWER
OVER TEMP
Over Temp LED
D
Removable Plastic Grilles
E
page 9
figure 6
on page 9).
XPA Ultra FX Series Power Amplifiers • Operation
A
on page 9
on
8
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