1
IMPORTANT:
Go to www.extron.com for the
complete user guide and installation
instructions before connecting the
product to the power source.
www.extron.com
XPA U Full Rack Series Audio Power Amplifiers • Setup Guide
This guide provides startup instructions for experienced, professional installers to set up and operate the XPA U Full Rack Series
audio power ampliers:
• XPA U 2004 FX — 4 x 200 watts per channel at 8Ω, 4Ω, 70V, or 100V
• XPA U 2008 FX — 8 x 200 watts per channel at 8Ω, 4Ω, 70V, or 100V
For information not included in this setup guide, see the XPA U Full Rack Series User Guide, at www.extron.com.
WARNING: Installation and service must be performed by experienced, professional installers only.
AVERTISSEMENT : L’installation et l’entretien doivent être effectués par des installateurs professionnels
expérimentés.
Rack Mounting
Before mounting the ampliers, ensure that power to the amplier is turned off.
Turn off all other equipment and disconnect the power cables. Verify that the amplier is disconnected from the power source
before proceeding.
The XPA U Full-Rack Series ships with two rear rack ears to provide additional stability and support for the amplier. Each rear
rack ear attaches to the amplier by means of two SEMS screws that connect though slots in the two support anges on the
enclosure that extend past the rear panel, through the slots in the rear rack ear and into the backing plate. The backing plate
comes loosely attached to the rear rack ear, which allows it to slide along the slots. The rear rack ears will support rack rail
depths of 15.69" (399 mm) to 26.34" (669 mm), as measured from outward-facing surfaces of the front and rear rack rails.
16.49" (419 mm)
26.34" (669 mm)
27.04" (689 mm)
16.39" (416 mm)
15.69" (399 mm)
Figure 1. XPA U Full Rack Series Side View
2
XPA U Full Rack Series Audio Power Amplifiers • Setup Guide (Continued)
To install the amplier into the equipment rack, follow these steps:
1
1
1
1
1
1
Screws
Fr
ont Rack Ear
3
3
3
2
2
2
2
2
2
3
3
3
2
2
2
Screws
Rear Rack Ear
Equipment Rack
Figure 2. Installing XPA U Full Rack Series — 1
1. Attach the front rack ears of the ampier to the front of the rack, using the four provided screws (1).
2. The rear rack ears are installed into the corresponding position on the rails on the back side of the equipment rack (2).
3. Slide the backing plate into the slots in the support anges (3).
The screws are loosened just enough to allow the backing plate to easily slide into the slots in the support anges without
getting the washers caught between the ange and the rear rack ear, but not so much that the backing plate is disassembled
from the rear rack ear.
4. Tighten down the backing plate screws.
Rack Mounting Ventilation Recommendations
Excessive heat can decrease the optimal lifetime of the power amplier. An over temp indicator LED on the front panel of the
amplier lights red whenever the recommended operating temperature has been exceeded.
To reduce the chances of an over temp condition, the XPA U Full Rack Series Audio Power Ampliers should be arranged in a
rack environment so the environment around the amplier does not reach or exceed +122°F (+50°C).
These ampliers are cooled by forced air, with front to back airow. Care must be taken not to obstruct the airow at the intake
and exhaust vents.
3
XPA U Full Rack Series Connections and Controls
XPA U 2004 FX
100-240V
~
--A, 50-60Hz
REMOTE
1
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUAT IONOUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
2
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUATION OUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUATION OUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
3
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUAT IONOUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
4
INPUTS
1234 GSTANDBY
1 2 3 4
OUTPUTS
XPA U 2008 FX
100-240V
~
4.0A, 50-60Hz
REMOTE
1
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUAT IONOUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
2
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUATION OUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
5
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUATION OUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
6
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUATION OUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
8
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUATION OUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUATION OUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
3
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUAT IONOUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
4
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUATION OUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
7
LIM/
PRT
(HPF OFF)
(HPF OFF)
70V70V
100V
100V
8Ω
4Ω
SIG
ATTENUATION OUTPUT MODE
0
12
4
6
8
10
12
18
14
26
∞
8
INPUTS
12345678GSTANDBY
5 6 7 81 2 3 4
OUTPUTS
X
PA U 2004 FX (top) and XPA U 2008 FX (bottom)
1234 56
78
9
1 Rear Rack Ears (see Rack Mounting on page 1) 6 Output Mode Selection Switch (see page4)
2 IEC power connector 7 Speaker output connectors (see page4)
3 AC mains switch 8 Line inputs (see page4)
4 Channel Status LEDs 9 Remote Standby Port (see page5)
5 Attenuators
Figure 3. XPA U 2004 FX (top) and XPA U 2008 FX (bottom) Rear Panels
Power
ATTENTION:
• The amplier must be powered on last.
• L’amplicateur doit être mis sous tension en dernier.
Reconnect all power cables and switch on all other equipment before powering on the power amplier. The front panel power
LED of the amplier lights green.
2 IEC power connector — Connect this socket to 100 - 240 VAC, 50-60 Hz mains power supply.
3 AC mains switch — Toggle this switch between power on and power off.
Indicators and Settings
4 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 front panel LEDs.
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 sufcient 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.
5 Attenuators
Each channel has its own potentiometer that goes from full attenuation (fully counterclockwise) to no
attenuation (fully clockwise). Each potentiometer is detented to more easily set the input signal level of
multiple channels to the same level of attenuation, and laser-etched to indicate position.
figure 3
IEC power connector
AC mains switch
LIM/
PRT
SIG
Channel Status LEDs
Attenuators
ATTENUATION
0
12
4
6
8
10
12
18
14
26
∞
4
XPA U Full Rack Series Audio Power Amplifiers • Setup Guide (Continued)
6 Output Mode Selection Switch (see figure 3 on page 3)
This switch determines the function of each amplier channel. There are six settings: two low-impedance
(8 ohms, 4 ohms) and four high-impedance modes.
Low-Impedance Modes (8 ohm/4 ohm):
The 8 ohm stereo setting is used when connecting to 8 ohm speaker loads, and the 4 ohm setting is used
when connecting to 4 ohm loads.
High-Impedance Modes:
• There are four high-impedance modes available: 70V, 70V (HPF OFF), 100V, 100V (HPF OFF). These modes are used
when connecting to distributed 70 volt or 100 volt loudspeaker systems.
• In the 70V and 100V modes, an 80Hz, 12 dB/octave high-pass lter is applied to the signal, to prevent saturation of the
transformer cores in the speakers.
• In the 70V (HPF OFF) and 100V (HPF OFF) modes, the high-pass lter is disabled. The (HPF OFF) modes should only be
used when a high-pass lter will be applied in a DSP upstream of the amplier.
Connections
7 Speaker output connectors (see figure 3)
Wire the speakers to the amplier output using the included 2-pole, 5.08 mm captive screw connectors
(see gure 4, A). Each port has a screw ange to secure the plug to the connector (B).
Do not tin the wires!
CLASS 2 WIRING
AB
Figure 4. Connecting Speaker Outputs
ATTENTION:
• Do not tie channel output pins to each other or to ground. Doing so will short out the outputs, damage the
amplier, or both.
• Ne pas lier les sorties 1 et 2 des canaux entre elles ou à la terre. Les sorties pourraient être court-circuitées et/ou
l’amplicateur pourrait être endommagé.
• To avoid risk of damage to the ampliers or speakers, ensure that the amplier output mode selection switch for
each channel is properly congured to match the type of speaker load about to be connected to the particular
output.
• Pour éviter tout risque de détérioration des amplicateurs ou des enceintes, assurez-vous que le switch de
sélection du mode de sortie de l’amplicateur est correctement conguré pour s’adapter au type de charge de
l’enceinte qui sera connectée à la sortie donnée.
NOTE: You must use Class 2 wiring for this output to comply with UL requirements.
8 Line inputs (see figure 3)
Use 5-pole 3.5 mm captive screw connectors to input four (XPA U 2004 FX) or eight (XPA U 2008 FX) channels of balanced or
unbalanced line-level audio signals through these connectors.
Wire the source output to the captive screw connectors as shown in the following illustrations.
Balanced Stereo Input
Tip
Ring
Tip
Ring
Slee
ves
12
Unbalanced Stereo Input
Tip
Sleeve
Sleeve
Tip
12
Do not tin
the wires!
Balanced Dual Mono Input
Tip
Ring
Sleeve (s)
Tip
Ring
12
Unbalanced Dual Mono Input
Tip
Sleeve
Tip
Sleeve
12
Output Mode Selection Switch
(HPF OFF)
(HPF OFF)
70V 70V
100V
100V
8Ω
4Ω
OUTPUT MODE
Speaker output connectors
Line inputs
5
9 Remote Port (see figure 3) — Use the 3.5 mm 2-pole captive screw connector to connect the STANDBY pin to the G pin.
This places the amplier in standby mode.
The XPA U Full Rack Series ampliers 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 amplier 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 amplier in the various scenarios:
Remote Port Action Inactivity Timer Defeated? Time Since Last Detected Signal
Less than 25 minutes More than 25 minutes
No action (open) No Amplier remains active Amplier enters standby
Open to Close No Amplier enters standby Amplier remains in standby
Close to Open No Amplier becomes active
Timer restarts
Amplier becomes active
Timer restarts
No action (open) Yes Amplier remains active -
Open to Close Yes Amplier enters standby -
Close to Open Yes Amplier becomes active -
Front Panel Features
58761432
OVER TEMP
LIMITER/
PROTECT
SIGNAL
XPA U 2008 FX
POWER
4312
OVER TEMP
LIMITER/
PROTECT
SIGNAL
XPA U 2004 FX
POWER
34 521 1
1Groove for inserting Grille removal tool 4Over Temp LED
2Channel Status LEDs 5Removeable Plastic Grilles
3Power LED
Figure 5. XPA U 2004 FX (top) and XPA U 2008 FX (bottom) Front Panels
1 Groove for inserting Grille removal tool — Insert the included plastic pry tool, athead screwdriver, or other small at
object into this groove and pull forward to remove the plastic Grille.
2 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 figure 3 on page 3)).
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 sufcient 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.
Remote Standby Port
REMOTE
G
STANDBY
figure 5
Removeable Plastic Grilles
68-3690-50 Rev. A
12 22
XPA U Full Rack Series Audio Power Amplifiers • Setup Guide (Continued)
© 2022 Extron — All rights reserved. www.extron.com
All trademarks mentioned are the property of their respective owners.
Worldwide Headquarters: Extron USA West, 1025 E. Ball Road, Anaheim, CA 92905, 800.633.9876
For information on safety guidelines, regulatory compliances, EMI/EMF compatibility, accessibility, and related topics, see the
Extron Safety and Regulatory Compliance Guide on the Extron website.
3 Power LED (see figure 5 on page 5) — A single LED power indicator will light as follows:
• Green when the unit is on and active
• Amber
• When the unit is in standby. Standby mode turns off all outputs from the amplier, although the amplier is still
receiving power.
• When DC voltage is detected on the output. This state is cleared only via reset/power down. If it is not cleared via
reset/power down, the unit may need to be serviced.
4 Over Temp LED — Lights red when the amplifier has exceeded the maximum recommended operating temperature. The
amplifier self-recovers once the unit has cooled below the maximum recommended operating temperature.
Power limiting may or may not be applied at this point. This depends on the temperature of the unit.
5 Removable Plastic Grilles (2) — The removable plastic grille assembly is secured to the steel front chassis by two tabs on
the inner edge that hook under the center UI section and are held in place by a neodymium magnet on the outside edge. The
grilles are removable by inserting the included plastic removal tool into the front panel groove and pulling forward.
Each plastic grille covers a foam air lter. The lters are held in place inside the grille by crush ribs along the inside edges of
the grille.
To replace the lters, remove the grille from the front panel by inserting the included plastic pry tool, athead screwdriver, or
other small at object into the groove along the outer edge of the grille and pulling forward. Remove and wash or replace the
lter.
Power LED
Over Temp LED
/
