User Guide
XPA U 3502
XPA Ultra Series
Half-Rack Audio Power Amplifier
68‑3545‑01 Rev. A
05 21
Copyright
© 2021 Extron. All rights reserved. www.extron.com
Trademarks
All trademarks mentioned in this guide are the properties of their respective owners.
The following registered trademarks (
®
), registered service marks (
SM
), and trademarks (
TM
) are the property of RGBSystems, Inc. or Extron (see the
current list of trademarks on the Terms of Use page at www.extron.com):
Registered Trademarks
(
®
)
Extron, Cable Cubby, ControlScript, CrossPoint, DTP, eBUS, EDID Manager, EDID Minder, eLink, Flat Field, FlexOS, Glitch Free, GlobalConfigurator,
GlobalScripter, GlobalViewer, Hideaway, HyperLane, IPIntercom, IPLink, KeyMinder, LinkLicense, LockIt, MediaLink, MediaPort, NAV,
NetPA, PlenumVault, PoleVault, PowerCage, PURE3, Quantum, ShareLink, Show Me, SoundField, SpeedMount, SpeedSwitch, StudioStation,
SystemINTEGRATOR, TeamWork, TouchLink, V‑Lock, VideoLounge, VN‑Matrix, VoiceLift, WallVault, WindoWall, XPA, XTP, XTPSystems, and ZipClip
Registered Service Mark
(SM)
: S3 Service Support Solutions
Trademarks
(
™
)
AAP, AFL (Accu‑RATEFrameLock), ADSP(Advanced Digital Sync Processing), AVEdge, CableCover, CDRS(ClassD Ripple Suppression),
CodecConnect, DDSP(Digital Display Sync Processing), DMI (DynamicMotionInterpolation), DriverConfigurator, DSPConfigurator, DSVP(Digital
Sync Validation Processing), EQIP, Everlast, FastBite, Flex55, FOX, FOXBOX, IP Intercom HelpDesk, MAAP, MicroDigital, Opti‑Torque,
PendantConnect, ProDSP, QS‑FPC(QuickSwitch Front Panel Controller), RoomAgent, Scope‑Trigger, SIS, SimpleInstructionSet, Skew‑Free,
SpeedNav, Triple‑Action Switching, True4K, True8K, Vector™ 4K, WebShare, XTRA, and ZipCaddy
FCC Class B Notice
NOTE: This device complies with part 15 of the FCC rules. Operation is subject to the
following two conditions: (1) This device may not cause harmful interference, and (2)
This device must accept any interference received, including interference that may
cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part15 of the FCC rules. These limits provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications. There is no
guarantee that interference will not occur. If this equipment does cause interference to radio
or television reception, which can be determined by turning the equipment off and on, you
are encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
In order to maintain compliance with FCC regulations, shielded cables must be used with
this equipment. Operation with non-approved equipment or unshielded cables is likely to
result in interference to radio and TV reception. The user is cautioned that changes and
modifications made to the equipment without the approval of the manufacturer could void
the user’s authority to operate this equipment.
NOTE: For more 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.
Regulatory Notice
WARNING: Potential risk of severe injury or death.
AVERTISSEMENT : Risque potentiel de blessure grave ou de mort.
• The circuit breaker used for this connection should be rated no lower than 20
amps and no greater than 30 amps.
• El disyuntor utilizado para esta conexión no debe tener una capacidad nominal
de entre 20 y 30 amperios.
• This product is intended for indoor use and dry environment only. The device
must not be exposed to dripping or ingress of water and that other objects filled
with liquids, su h as glasses, should be placed on the apparatus.
• Este producto está diseñado para uso en interiores y ambientes secos
únicamente. El dispositivo no debe exponerse a goteos ni a la entrada de agua y
deben colocarse sobre el aparato otros objetos llenos de líquido, como vasos.
• XPA Ultra series are Class I products and must be connected to the MAINS
outlet ELECTRICAL with a protective ground connection.
• La serie XPA Ultra son productos de Clase I y deben conectarse a la toma de
corriente ELÉCTRICA con una conexión a tierra de protección.
• Where a mains plug or appliance connector is used as the disconnecting device,
the disconnecting device must remain easily operative.
• Cuando se utilice un enchufe de red o un conector de aparato como dispositivo
de desconexión, el dispositivo de desconexión debe permanecer operativo
fácilmente.
Conventions Used in this Guide
Notifications
The following notifications are used in this guide:
DANGER:
• Will result in serious injury or death.
• Entraînera des blessures graves ou la mort.
WARNING: Potential risk of severe injury or death.
AVERTISSEMENT : Risque potentiel de blessure grave ou de mort.
CAUTION: Risk of minor personal injury.
ATTENTION : Risque de blessuremineure.
ATTENTION:
• Risk of property damage.
• Risque de dommages matériels.
NOTE: A note draws attention to important information.
TIP: A tip provides a suggestion to make working with the application easier.
viiiXPA U 3502 • Table of Contents
Contents
Introduction ................................................1
About this Guide .................................................. 1
About the XPA U 3502......................................... 1
Features .............................................................. 2
Installation .................................................. 4
Mounting the XPA U 3502 Amplifier ..................... 4
Tabletop Use ................................................... 4
UL Rack Mounting Guidelines .......................... 4
Rack Mounting ................................................ 5
Rack Shelf Mounting........................................ 6
Rack Mounting Ventilation
Recommendations ......................................... 7
Flexible Conduit Adapter Kit Installation ............... 8
UL Requirements ............................................. 9
Installing the Flexible Conduit Adapter Kit ........ 9
Operation.................................................. 12
Front Panel Features .......................................... 12
Rear Panel Features .......................................... 13
Remote Volume Control Port ......................... 15
Remote Standby Port .................................... 16
Troubleshooting ................................................. 17
Amplifier Fails to Exit Standby Mode
Promptly ....................................................... 17
Amplifier Enters Standby Mode Too Early ....... 18
Limiter/Protect LED Warning Indicators.......... 18
Over Temp Indicator LED ............................... 18
XPA U 3502 • Introduction 1
Introduction
This section gives an overview of the Extron XPA U 3502 two-channel audio power amplifier.
Topics include:
• About this Guide
• About the XPA U 3502
• Features
About this Guide
This guide describes the XPA U 3502 two-channel audio power amplifier and discusses
how to install, configure, and operate it.
In this guide, the terms “unit”, “amplifier”, and “power amplifier” refer to the XPA U 3502.
About the XPA U 3502
The Extron XPA U 3502 is an ENERGY STAR-qualified two-channel audio power amplifier
that can drive 8 ohm or 4 ohm loads. The XPA U 3502’s outputs can deliver two 350 watt
channels into low-impedance systems.
The convection-cooled, plenum-rated enclosure of the XPA U 3502 doesn’t require empty
rack spaces for ventilation and include rack mount hardware. It features a highly efficient,
advanced Class D amplifier design with defeatable auto standby, fast wake up from
standby, and patented Extron CDRS (Class D Ripple Suppression) technology. Remote
volume and mute control is possible via Extron VCM, VC, select MediaLink controllers, and
Extron Control products with the digital Remote Volume Control Ports.
XPA U 3502 • Introduction 2
Features
• 350 Watts per channel into 8 ohms or 4 ohms
• ENERGY STAR
®
qualified amplifier — The XPA U 3502 is an ENERGY STAR-qualified
and energy efficient amplifier conserving energy and reducing costs.
• Extron Patented CDRS (Class D Ripple Suppression) Technology — CDRS is an
Extron pantented technology providing a smooth and clean audio waveform, and improving
signal fidelity over Class D amplifier designs. CDRS eliminates the high frequency switching
ripple characteristics of Class D amplifiers, a source of RF emissions which can interfere
with sensitive AV equipment like wireless microphones.
• Convection cooled and fanless operation - can be stacked without extra rack
space for ventilation — The XPA U 3502 does not have internal fans or vents for
cooling, ensuring quiet reliable operation. The unit generates substantially less heat than
conventional power amplifiers, making the XPA U 3502 ideal for rack-mount applications
where space is limited.
See Rack Mounting Ventilation Recommendations on page7.
• Defeatable auto-standby with fast wake up — The amplifier meets ENERGY STAR
qualification requirements with an auto-standby feature that automatically places the
unit into standby after 25 minutes of inactivity, thereby dramatically reducing power
consumption. The XPA U 3502 quickly returns to full power in less than 100 ms upon signal
detection, with minimal inrush current. Auto-standby can be disabled if required.
• UL 2043 Plenum-rated when used with the optional Flexible Conduit Adapter
Kit/AV equipment — The XPA U 3502 amplifier meets UL 2043 when installed with the
Flexible Conduit Adapter Kit, part # 70-228-02. The amplifier must meet this requirement
for heat and smoke release for installation within a plenum airspace. Above-the-ceiling
placement conceals the amplifier to prevent theft, and it is convenient for installing when
space inside the room is limited.
• 1U, half-rack enclosure — mounts in a standard rack enclosure with the included
hardware.
• Remote volume and mute control per channel — With Extron VCM, VC, and select
MediaLink controllers.
• Professional grade signal-to-noise and THD+N performance — The XPA U 3502
delivers professional grade performance, featuring 100 dB signal-to-noise ratio and THD+N
of less than 0.1%.
• Ultra low inrush current at power up - no need for power sequencing — Allows
multiple XPA Ultra amplifiers to be powered on simultaneously without overloading power
circuits. This eliminates the need for power sequencing.
• Power factor correction - removes harmonic content on AC line — The XPA U 3502
features power factor correction technology that smooths out the high peak currents of the
amplifier’s current draw, minimizing the presence of high-frequency harmonics on the AC
power line, preventing audible artifacts from being transmitted to other audio equipment in
the system.
• Rear panel recessed, detented level controls — Provides attenuation of input signal
for adjusting audio system gain staging. These controls are lcoated on the rear panel to
prevent tampering with the level adjustments. Laser-etched markings provide enhanced
visibility of settings for ease of configuration.
• Remote standby port — Enables the XPA U 3502 to be remotely powered down when
not in use, reducing operating cost.
• Automatic clip limiter — Detects actual onset of clipping. Gain is automatically reduced
without audible artifacts to prevent clipping distortion.
XPA U 3502 • Introduction 3
• Multiple protection circuits — Activate during output shorts, thermal overload, or DC
faults to prevent damage to the amplifier and speakers.
• 5 mm screw-lock captive screw speaker connectors — Enable simple, secure
connections with 22 to 12 AWG speaker cables.
• Front and rear-mounted signal and protection indication LEDs — Provide
convenient indication of input signal presence and protection circuit activation from both
sides of an equipment rack.
• Front panel over-temperature LED — Provides visual indication that the amplifier’s
temperature has exceeded the optimal value, well in advance of the onset of thermal
protection circuitry.
• Internal Extron Everlast
™
power supply — Provides worldwide power compatibility,
with high-demonstrated reliability and low power consumption for reduced operating
cost.
• Extron Everlast Power Supply is covered by a 7-year parts and labor warranty.
XPA U 3502 • Installation 4
Installation
This section describes the installation and setup of the XPA U 3502 power amplifier.
Topics include:
• Mounting the XPA U 3502 Amplifier
• Flexible Conduit Adapter Kit Installation
Mounting the XPA U 3502 Amplifier
The XPA U 3502 can be mounted in a rack using rack ears, mounted on a rack shelf, set
on a table, or mounted in the plenum space above a ceiling-mounted projector. Also, two
amplifiers can be connected using the bridging plate to create a full rack-width unit.
Tabletop Use
Four self-adhesive rubber feet are included. Attach one foot at each corner on the bottom
side of the amplifier and place the unit in a desired location.
UL Rack Mounting Guidelines
The following Underwriters Laboratories (UL) guidelines pertain to the safe installation of the
equipment in a rack.
• Elevated operating ambient temperature — If the equipment is installed in a closed
or multi-unit rack assembly, the operating ambient temperature of the rack environment
may be greater than room ambient temperature. Therefore, install the equipment in an
environment compatible with the maximum ambient temperature (TMA = +32° F to
+122° F (0° C to +50° C)/ 10% to 90%, noncondensing) specified by Extron.
• Reduced air flow — Install the equipment in a rack so the amount of air flow required
for safe operation of the equipment is not compromised.
• Mechanical loading — When mounting the equipment in the rack, ensure uneven
mechanical loading does not cause a hazardous condition.
• Circuit overloading — When connecting the equipment to the supply circuit, consider
the effect circuit overloading might have on overcurrent protection and supply wiring.
Consider equipment nameplate ratings when addressing this concern.
• Reliable earthing (grounding) — Maintain reliable grounding of rack-mounted
equipment. Pay particular attention to supply connections other than direct connections
to the branch circuit (for example, use of power strips).
XPA U 3502 • Installation 5
Rack Mounting
The XPA U 3502 can be mounted into a rack using one of the following methods.
Rack Ear Mounting
The XPA U 3502 ships with a set of rack ears, so that the half rack-width amplifier can be
installed in a full rack-width space.
Mount the amplifier with the rack ears by doing the following:
1. Remove the rubber feet from the bottom of the amplifier, if previously installed.
2. Attach the included rack ears to the sides of the amplifier with the four provided #6
machine screws (
1
).
Figure 1. Installing XPA U 3502 Rack Ears
3. Insert the amplifier into the rack and align the holes in the rack ear with the holes on the
rack.
4. Secure the amplifier to the rack using four provided 10-32 x 3/4” screws (
2
).
Side-by-Side Rack Mounting
The XPA U 3502 ships with a bridge plate connector to allow two amplifiers to be
connected together and form a full rack-width unit.
Mount two XPA Ultra Series amplifiers by doing the following:
1. If the rubber feet are installed on the bottom of the amplifier, remove them.
2. Position two amplifiers upside down and next to each other.
3. Use the bridge plate connector and the four provided #4 machine screws to connect
the two amplifiers together (see figure 2,
1
, on the next page).
4. Attach the two short rack ears to the amplifiers with four provided #6 machine screws
(see
2
).
1
XPA U 3502 • Installation 6
Figure 2. Installing XPA U 3502 Bridge Plate
5. Insert the amplifiers into the rack and align the holes in the rack ears with the holes in
the rack.
6. Secure the amplifiers to the rack using four provided 10-32 3/4” screws (see figure 3,
3
)
Figure 3. Secure Connected XPA U 3502 Amplifiers to Rack
Rack Shelf Mounting
The XPA U 3502 can be mounted in a shelf using the optional RSU 129 1U Universal Rack
Shelf Kit.
Mount the amplifier with the shelf as follows:
1. If the rubber feet are installed on the bottom of the amplifier, remove them.
2. Place the amplifier on one half of the rack shelf.
3. Align the front of the amplifier with the front of the shelf, and align the threaded holes on
the bottom of the amplifier with the holes in the rack shelf.
4. Attach the amplifier to the rack shelf with the two provided 4-40 x 3/16” machine
screws. Fasten them into diagonally opposite corners by inserting the screws from the
underside of the shelf.
ATTENTION:
• Using screws longer than 3/16” will damage the unit and void the warranty.
• L’utilisation de vis plus longues que 3/16” endommagera l’unité et annulera la
garantie.
2
3
XPA U 3502 • Installation 7
5. Either attach the false front panel, which is provided with the rack shelf, to the
unoccupied side of the rack, or install a second half rack-width device to that side.
Repeat steps 1 through 4 if a second device is being installed.
6. Attach the rack to the shelf by using the four 10-32 x 3/4” screws provided with the
shelf. Insert the screws through #10 beveled washers, then through the holes in the
rack (see figure 4).
Figure 4. Mounting the Amplifier onto a Rack Shelf
Rack Mounting Ventilation Recommendations
Excessive heat decreases the optimal lifetime of the power amplifier. An Over Temp indicator
LED on the front panel of the amplifier lights red whenever the recommended operating
temperature has been exceeded.
The XPA U 3502 amplifier needs to be arranged in a rack environment, so that the
environment around the amplifier does not reach or go beyond +122 °F (+50 °C). No more
than four amplifiers should be stacked vertically without an open space in between, as seen
in figure 5.
Figure 5. Vent Space Example
The XPA U 3502 amplifier can be arranged above or below another non-XPA Ultra device.
The environment around the amplifier should still not reach or go beyond +122 °F (+50 °C).
4
5
XPA U 3502 • Installation 8
Flexible Conduit Adapter Kit Installation
WARNING :
AVERTISSEMENT :
• The circuit breaker used for this connection should be rated no lower than 20 amps and no
greater than 30 amps.
• Le disjoncteur utilisé pour cette connexion devrait avoir une cote comprise entre 20 et
30 amps.
• This unit must be installed in accordance with the National Electrical Code and with all
local codes.
• Cet appareil doit être installé conformément au National Electrical Code et à tous les
codes locaux.
• An ALL-POLE MAINS SWITCH with a contact separation of at least 3 mm in each
pole shall be incorporated in the electrical installation of the building, The installation
shall be carried out in accordance with all applicable installation rules.
• Un interrupteur omnipolaire avec une séparation contact d’au moins 3 mm dans
chaque pôle, devra être incorporée dans l’installation électrique du bâtiment.
L’installation doit être réalisée conformément à toutes les règles d’installation
applicables.
• Installation and service must be performed by a qualified electrician only.
• L’installation et l’entretien doivent être effectués uniquement par un électricien qualifié.
• Make sure the source device and the XPA are turned off and disconnected from the
power source before you begin.
• Vérifiez que l’appareil source et le périphérique source sont éteints et déconnectés de
la source d’alimentation avant de commencer.
• To reduce the risk of fire or electric shock, do not expose this apparatus to rain or
moisture.
• Afin de réduire les risques d’incendie ou de choc électrique, protégez cet appareil de
la pluie ou de l’humidité.
• The product is a Class I product, which must be connected only to a mains socket
outlet with a protective earthing (grounding) connection.
• Ce produit est un produit de Classe I, qui doit être connecté seulement à une prise
femelle secteur équipée d’une connexion de mise à la terre.
• The mains plug/appliance coupler is used as the disconnect device and shall remain
readily operable.
• La fiche secteur / le coupleur d’appareil est utilisé comme dispositif de déconnexion et
doit rester facilement utilisable.
ATTENTION:
• A UL-Listed electrical distribution box is recommended for the termination of
the conduit opposite the PS 124 power supply or the XPA amplifier. See UL
Requirements below.
• Un boîtier de distribution électrique certifié UL est recommandé pour la terminaison du conduit à
l’opposé de l’alimentation PS 124 ou de l’amplificateur XPA. Voir “UL Requirements” on page
9.
XPA U 3502 • Installation 9
The optional Flexible Conduit Adapter Kit includes the following parts:
• One conduit adapter plate (pre-attached), for PS 124 and XPA Series amplifiers
• One conduit adapter plate for XPA Ultra Series and NetPA Ultra Series amplifiers
(not attached)
• One 6 foot long electrical conduit
• Three 7.5 foot, 18-gauge power wires with spade connectors
• Three auxiliary crimp-style spade connectors designed for 14- to 16-gauge wires
• One UL-rated zip tie wrap
The kit provides a way to replace the IEC power cord with a conduit, where required by
local codes.
NOTE: If needed, Extron recommends using a UL-rated crimp tool to terminate the spade
connectors. One recommended choice is the Molex crimp tool.
UL Requirements
The Underwriters Laboratories (UL) requirements listed below pertain to the installation
of the flexible conduit onto an XPA U 3502.
• This unit must not be used beyond its rated voltage range.
• This unit must be wired to a UL-Listed distribution box.
NOTE: The UL-approved electrical distribution box is not included with either the XPA
Ultra or the Flexible Conduit Adapter Kit. The installer is responsible for obtaining and
installing the box.
Installing the Flexible Conduit Adapter Kit
WARNING: Electrostatic discharge (ESD) can damage IC chips even though you cannot
feel it. You must be electrically grounded before touching anything inside the XPA. A
grounding wrist strap is recommended.
AVERTISSEMENT : Les décharges électrostatiques peuvent endommager les puces de
circuit même si vous ne pouvez pas les sentir. Vous devez être électriquement relié à la
terre avant de toucher un élément à l’intérieur du XPA. Un braceletde mise à la terreest
recommandé.
Install the flexible conduit to the XPA U 3502 Amplifier as follows:
1. Unplug the IEC power cord from the amplifier.
2. Remove the 10 screws from the top, sides, and bottom of the amplifier then slide and
lift the cover off.
XPA U 3502 • Installation 10
Figure 6. Removing the Cover
3. Remove the two screws holding the blue hot line and the brown neutral wires from the
terminal block on the PCB. Put the screws to the side to be used later (see figure 7).
4. Remove the ground wire nut from the grounding stud located on the bottom of the
enclosure as shown in figure 7, below. Place the nut with the other screws to be used
later.
5. Remove the wires attached to the IEC connector from the body of the amplifier, and
slide the IEC connector and wire up and out of the amplifier’s enclosure (see figure 7).
Figure 7. Removing the IEC Connector
6. Remove the washer at the end of the conduit (see Washer-B in figure 8), and remove
the conduit adapter plate that ships attached to the conduit.
Figure 8. Removing the Existing Adapter Plate
6
step 3
step 5
step 5
7
8
XPA U 3502 • Installation 11
7. Place the adapter plate that ships with the conduit kit on the conduit itself with the flat
side of the plate facing the hexgonal nut, and secure the new plate to the conduit with
the washer that was removed in step 6 (see figure 9).
Figure 9. Secure XPA Ultra Series Adapter Plate to Conduit
8. Thread the blue, brown, and green 18-gauge power wires that are included with the
flexible conduit adapter kit through the length of the electrical conduit.
9. Install the conduit with the new conduit plate attached into the opening from where the
IEC connector removed in step 5.
10. Connect the blue hot (line) and the brown neutral wires to the terminal block on the PCB
using the two screws removed back in step 3. Use the included zip tie wrap to secure
the two wires together close to the terminals.
WARNING: Ensure that you observe correct wire polarity. The following illustration
shows the location of the hot (line) and neutral terminals.
AVERTISSEMENT : Respecter la polarité correcte des câble. L’illustration suivante
indique l’emplacement des bornes de ligne et de neutre.
Figure 10. Install the Conduit Assembly
11. Connect the ground wire, as shown in figure 10, above, to the grounding stud located
on the bottom of the enclosure using the nut removed in step 4.
12. Replace the cover of the XPA U 3502 amplifier by reattaching the ten screws removed
in step 2.
9
10
XPA U 3502 • Installation 12
Operation
This section describes the installation and setup of the XPA U 3502 power amplifier.
Topics include:
• Front Panel Features
• Rear Panel Features
• Troubleshooting
Front Panel Features
A
Power/Standby Indicator
B
Over Temp Indicator
C
Channel Status LEDs
Figure 11. XPA U 3502 Front Panel
A
Power/Standby LED — A single LED that lights green when the unit is on and active,
and lights amber when:
• The unit is in standby mode, which turns off all outputs from the amplifier although
the amplifier still receives power.
• The unit will not come out of standby when DC voltage is detected. The amplifier
only comes out of standby mode by either resetting the device or powering it down.
NOTE: Power indicator LED may stay lit amber for a short time after removing the AC
Power Supply. This is normal.
B
Over Temp Indicator — A single LED that lights red when the amplifier has exceeded
the maximum recommended operating temperature. The amplifier recovers once the
unit has cooled down to below the maximum recommended operating temperature.
Power limiting may occur, but it depends on the unit’s temperature.
C
Channel Status LEDs — Two rows of LEDs that represent the amplifier’s channels.
• Limiter/Protect LED — The LEDs lights red when the channel is in protection
mode, which is triggered by any of the limiter protection circuits such as:
• When the clip limiter is activiated due to excessive clipping.
• When the output short circuits.
• Signal LED — The LEDs light green when the input signal is detected.
NOTE: The LEDs are also located on the rear panel.
11
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