L-Acoustics LA2Xi User manual

LA2Xi
owner's manual (EN)

Document reference: LA2Xi owner's manual (EN) version 1.0
Distribution date: October 14, 2020
© 2020 L-Acoustics. All rights reserved.
No part of this publication may be reproduced or transmitted in any form or by any means without the
express written consent of the publisher.

Contents
Safety................................................................................................................................................................ 5
Important safety instructions....................................................................................................................... 5
Introduction........................................................................................................................................................ 7
LA2Xi amplied controller..........................................................................................................................7
How to use this manual............................................................................................................................ 7
System components.............................................................................................................................................8
Technical description........................................................................................................................................... 9
Main features........................................................................................................................................... 9
Internal components.........................................................................................................................9
Front and rear panels......................................................................................................................9
Signal processing and amplication........................................................................................................... 9
Signal inputs...................................................................................................................................9
DSP architecture............................................................................................................................10
Power supply and amplier section.................................................................................................12
Speaker outputs............................................................................................................................ 12
Speaker protection........................................................................................................................ 13
Monitoring and control............................................................................................................................13
User interface............................................................................................................................... 13
L-NET remote control network......................................................................................................... 13
Inspection and preventive maintenance...............................................................................................................14
How to do preventive maintenance.......................................................................................................... 14
External structure.....................................................................................................................................14
Cleanness...............................................................................................................................................15
Normal start-up sequence........................................................................................................................ 15
Network functionalities and rmware........................................................................................................15
Installation........................................................................................................................................................16
Mounting................................................................................................................................................16
Ventilation.............................................................................................................................................. 16
General Purpose I/O (GPIO)................................................................................................................... 17
Connecting to AC mains......................................................................................................................... 17
Electrical specications.................................................................................................................. 17
Planning the power of the electrical generator................................................................................. 18
Power cord...................................................................................................................................18
Plugging the amplied controller.....................................................................................................18
Power consumption........................................................................................................................19
3

Heat power calculation..................................................................................................................19
24 V DC Input............................................................................................................................. 19
Audio and network cabling..................................................................................................................... 20
Connection panels.........................................................................................................................20
Analog audio............................................................................................................................... 22
Digital audio................................................................................................................................ 23
L-NET........................................................................................................................................... 23
AVB............................................................................................................................................. 24
Speaker........................................................................................................................................24
Connector references...............................................................................................................................24
Operation........................................................................................................................................................ 25
Powering on/off..................................................................................................................................... 25
Interpreting the front panel LEDs...............................................................................................................25
L-NET........................................................................................................................................... 25
STATUS........................................................................................................................................ 25
Meters..........................................................................................................................................26
Other operations.....................................................................................................................................27
Setting the IP via USB................................................................................................................... 27
Specications................................................................................................................................................... 28
General................................................................................................................................................. 28
Input signal distribution............................................................................................................................30
Latency...................................................................................................................................................31
AVB.......................................................................................................................................................31
Automatic fallback option........................................................................................................................ 31
Remote control and monitoring.................................................................................................................31
Physical data..........................................................................................................................................32
Appendix A - Glossary..................................................................................................................................... 33
Appendix B - List of AVB reservation errors.........................................................................................................33
Appendix C - Approvals................................................................................................................................... 36
4

Safety
Safety
Important safety instructions
Inspect the product before operation.
If any sign of defect or damage is detected, immediately withdraw the product from use for maintenance.
Perform preventive maintenance at least once a year.
Refer to the preventive maintenance section for a list of actions and their periodicity.
Insufcient upkeep of the product can void the warranty.
Verify the electrical conformity and compatibility of the mains supply.
Only connect the product to an AC power outlet rated 100-240 V, 50-60 Hz, with the following current values:
100-120 V: 20 A
200-240 V: 10 A
WARNING: The product is of Class 1 construction and shall be connected to a mains socket outlet with a
protective connection to earth.
When the product is used in a three-phase circuit, verify the electrical conformity and
compatibility of the three-phase circuit.
Verify that the three phases work, and balance the loads between the three phases.
Verify that the neutral and earth work.
Never try to emulate a 230 V circuit connecting an apparatus to two live wires of a 120 V three-phase circuit.
Never try to emulate a 200 V circuit connecting an apparatus to two live wires of a 100 V three-phase circuit.
Always interconnect a Class C circuit breaker between the product and the mains supply.
The circuit breaker current rating depends on the mains voltage rating, as follows:
100-120 V: 20 A
200-240 V: 10 A
Electrical generator
You must power on the generator before powering on the product.
Terminals marked with the lightning ash symbol are HAZARDOUS LIVE.
The external wiring connected to these terminals requires installation by an instructed person or the use of
ready-made leads or cords.
Never attempt to touch any exposed speaker wiring while the product is operating: rst disconnect the connector
from the product.
Mute all output channels before connecting a speaker to an amplied controller.
Do not connect a speaker output in parallel or series with any output of another amplied controller.
Do not connect the speaker outputs to any other voltage source, such as a battery, power mains, or power supply,
regardless of whether the amplied controller is turned on or off.
Never incorporate equipment or accessories not approved by L-Acoustics.
Read all the related PRODUCT INFORMATION documents shipped with the products before
exploiting the system.
Intended use
This system is intended for use by trained personnel for professional applications.
As part of a continuous evolution of techniques and standards, L-Acoustics reserves the right
to change the specications of its products and the content of its documents without prior
notice.
Check www.l-acoustics.com on a regular basis to download the latest document and software updates.
LA2Xi owner's manual (EN) version 1.0 5

Safety
Beware of sound levels.
Do not stay within close proximity of loudspeakers in operation.
Loudspeaker systems are capable of producing very high sound pressure levels (SPL) which can instantaneously
lead to permanent hearing damage to performers, production crew and audience members. Hearing damage
can also occur at moderate level with prolonged exposure to sound.
Check the applicable laws and regulations relating to maximum sound levels and exposure times.
Beware of over power risks.
Only use compatible loudspeakers with appropriate presets to avoid damage to the loudspeakers.
Do not use the product outside its operating temperature range.
The product operates at a room temperature between -5 °C / 23 °F and 50 °C / 122 °F.
Do not expose the product to direct sun.
Do not expose the product to extreme conditions.
Do not expose the product to moisture (rain, mist, sea spray, steam, humidity, condensation…) or excessive heat
(direct sun, radiator…) for a long period of time.
For more information, refer to the Product protection ratings document, available on the website.
Only use the product in a conformed electro-magnetic environment (EN55035 standard).
Avoid radio interference.
This product has been tested and complies with the limits indicated in the EMC directive (Electro Magnetic
Compatibility). These limits are designed to provide reasonable protection against harmful interference from
electrical equipment, but it cannot be guaranteed that interference will never occur.
Product disconnection
To completely disconnect this product from the mains, disconnect the power supply cord plug from the mains
socket outlet.
Power supply cord and socket accessibility
The main plug of the power supply cord shall remain easily accessible.
The mains socket outlet shall be easily accessible.
Read the maintenance section of this document before servicing the product.
Contact L-Acoustics for advanced maintenance.
Any unauthorized maintenance operation will void the product warranty.
Before sending a product to L-Acoustics for maintenance, save all user presets to les using LA Network Manager.
Shipping
Use the original packaging for shipping the product, unless it is mounted in a rack with the front and rear panels
xed to the rack, as described in this manual.
6 LA2Xi owner's manual (EN) version 1.0

Introduction
Introduction
LA2Xi amplied controller
LA2Xi is a four-channel amplied controller dedicated to
permanent installations. Designed to match the power
of small format loudspeakers, LA2Xi can also be used to
support larger loudspeakers at lower SPL capability (4 x 4
single-ended mode) or at full SPL capability (4 x 3, 4 x 2
or 4 x 1 bridge mode).
The streamlined and elegant 1U front panel hides a powerful DSP engine with features for loudspeaker management,
protection and monitoring as well as a comprehensive set of tools for system adjustment and calibration. In addition
to analog and AES, LA2Xi integrates AVB signal inputs with Milan seamless network redundancy. Four GPIO and a
24 V DC backup power for the DSP card offer external control and improved reliability. The exible LA2Xi is ideal for
background music systems in leisure venues, distributed lls, studio monitors and private auditorium systems.
How to use this manual
The LA2Xi owner's manual is intended for all actors involved in the system design, implementation, preventive and
corrective maintenance of the LA2Xi product. It must be used as follows:
1. Read the technical description for an overview of all product elements, their features, and their compatibilities.
•Technical description (p.9)
2. Before installing the product, perform mandatory inspections and functional checks.
•Inspection and preventive maintenance (p.14)
3. To deploy the product, follow the step-by-step installation instructions and refer to the cabling schemes.
•Installation (p.16)
•Audio and network cabling (p.20)
4. To congure the settings and parameters of the product, follow the step-by-step operation instructions.
•Operation (p.25)
As part of a continuous evolution of techniques and standards, L-Acoustics reserves the right to
change the specications of its products and the content of its documents without prior notice.
Check www.l-acoustics.com on a regular basis to download the latest document and software updates.
Contact information
For information on advanced corrective maintenance:
• contact your Certied Provider or your L-Acoustics representative
• for Certied Providers, contact the L-Acoustics customer service: customer.ser[email protected]
LA2Xi owner's manual (EN) version 1.0 7

System components
Symbols
The following symbols are used in this document:
This symbol indicates a potential risk of harm to an individual or damage to the product.
It can also notify the user about instructions that must be strictly followed to ensure safe installation or operation of
the product.
This symbol indicates a potential risk of electrical injury.
It can also notify the user about instructions that must be strictly followed to ensure safe installation or operation of
the product.
This symbol noties the user about instructions that must be strictly followed to ensure proper installation or
operation of the product.
This symbol noties the user about complementary information or optional instructions.
Do not open unless authorized.
This symbol indicates the presence of electrical shock hazards.
It also indicates that no maintenance performed by the end user requires access to internal components.
System components
Loudspeaker enclosures
Refer to the user documentation of the loudspeaker systems for detailed instructions about the enclosures and their
connection to the amplied controllers.
Powering and driving system
LA2Xi Amplied controller with DSP, preset library and networking capabilities
Software applications
LA Network Manager Software for remote control and monitoring of amplied controllers
Refer to the Soundvision help.
Refer to the LA Network Manager help.
Illustrations
LA Network Manager
8 LA2Xi owner's manual (EN) version 1.0

Technical description
Technical description
Main features
Internal components
The core of the LA2Xi is a Gen. 4 dual DSP engine driving four channels of amplication from four inputs. LA2Xi features
a ash memory for preset storage and management, high performance A/D-D/A converters for audio signals, a
universal Switched Mode Power Supply (SMPS) with PFC (Power Factor Correction), and a dual-port Ethernet Gigabit
interface.
Front and rear panels
14 2 3
1. power LED
2. L-NET LED
3. status LED
4. signal LEDs
4
1 2 3 5 6 7
1. V-Lock compatible IEC connector
2. output female 4-point terminal blocks
3. 24 V DC male 2-point terminal block to connect a backup power supply for the DSP
4. General Purpose I/O (GPIO)
5. input/Link male 3-point terminal blocks
6. 1 Gb/s Ethernet etherCON I/O connectors
7. mini USB for conguring IP settings - refer to Setting the IP via USB (p.27)
Signal processing and amplication
Signal inputs
Analog
LA2Xi can be fed with up to four balanced analog audio signals using the four male 3-point terminal blocks (ANA IN A,
ANALOG IN B, ANA IN C, and ANALOG IN D).
The input signals can be transmitted to daisy-chained amplied controllers by wiring the inputs of the next unit in the
same terminal blocks.
To be processed by the DSP, the analog signal must be converted into a digital signal. For this purpose, the LA2Xi
amplied controller is tted with one 32-bit A/D converter with a sampling rate of 96 kHz.
LA2Xi owner's manual (EN) version 1.0 9

Technical description
AES/EBU
LA2Xi can be fed with up to four AES/EBU digital audio signals (transported in pairs) using the two male 3-point terminal
blocks (AES IN A&B and AES IN C&D).
The audio signals can come from a digital mixing desk or from a digital audio network bridge compliant with the AES/
EBU (AES3) digital audio standards.
The input signals can be transmitted to daisy-chained amplied controllers using the two male 3-point terminal blocks
(AES LINK A&B and AES LINK C&D).
Each AES/EBU input port is equipped with an SRC (Sample Rate Converter) that has been selected to support a wide
range of input formats (16 - 24 bits / 44.1 - 192 kHz). The SRC converts the formats to the 24 bits / 96 kHz internal
format used by the amplied controller. The SRC is a high-quality hardware component (140 dB dynamic range,
THD+N<-120dBFS, strong input jitter attenuation) and provides constant propagation delay regardless of the input
sampling frequency.
There is no external synchronization mode. The amplied controller's clock runs using its high-precision internal quartz
at 96 kHz (or on the clock of the connected AVB input stream). This ensures low jitter and high audio quality in live
conditions (large cable lengths, large number of amplied controllers) while preventing phase shift, as required for line
source systems.
Digital domain benets
Keeping the signal in the digital domain provides the following benets (with any digital mixing desk or any audio
network) compared to the analog signal distribution:
• Better audio quality by removing one D/A - A/D cycle.
• Optimized level chain by removing the risk of level misalignment between console and amplied controllers.
• Digital signal refreshed at each amplied controller in a daisy-chain.
• Improved maximum cable length. LA2Xi has been tested with up to 300 m / 984 ft of two models of AES/EBU rated
cables (single cuts, digital source signal running at Fs = 48 kHz):
• 1696A from BELDEN INC.
• OT234H from KLOTZ communications GmbH.
AVB
One AVB stream of up to eight channels may be connected to LA2Xi. LA2Xi retrieves up to four channels from this stream.
Each Ethernet port uses a high speed data transfer protocol up to 1 Gb/s and supports the IEC 61883-6 AM824 and
AAF PCM32 stream formats with stream frequencies of 48 kHz or 96 kHz.
The amplied controller synchronizes its audio clock on the clock used by the talker through the incoming stream.
LA2Xi embeds an AVB bridge and may therefore be used to create an AVB network.
DSP architecture
The proprietary algorithms allow optimum performance and protection of each individual transducer of the L-Acoustics
systems for an even more natural, transparent and realistic sound experience.
• The DSP engine is a 32-bit oating point DSP at 96 kHz sampling rate providing an enhanced dynamic range since
it does not generate calculation clips like a xed point DSP.
• A dedicated engineering approach combining IIR and FIR lters generates perfectly linearized phase curves and
signicantly improved impulse responses.
• The 4 × 4 matrix architecture offers exibility for various system congurations.
• A delay of up to 1000 ms can be set for each output channel.
• The L-DRIVE transducer protection system offers advanced protection by simultaneously monitoring the excursion and
the temperature of the transducer.
• With a complete factory preset library and the possibility to create additional user presets, the ash memory
provides a quick access to all the usual L-Acoustics speaker system congurations (refer to the Preset Guide).
10 LA2Xi owner's manual (EN) version 1.0

Technical description
audio path parameters
LA2Xi owner's manual (EN) version 1.0 11

Technical description
Power supply and amplier section
The Class D amplication circuits ensure the LA2Xi energy efciency for minimal heat dissipation. LA2Xi delivers (no
limiter 200 ms, sine burst < 1% THD, 1 kHz):
• 4 × 640 W at 4 Ω
• 4 × 360 W at 8 Ω
• 4 × 190 W at 16 Ω
LA2Xi is a green amplied controller that relies on a universal Switched Mode Power Supply (SMPS) suitable for mains
100 V AC - 240 V AC (± 10%, 50 Hz - 60 Hz ). The SMPS features a PFC (Power Factor Correction) which maximizes
the amplier efciency and takes advantage of nearly 100% of the electrical power available with a very high tolerance
to unstable mains. This represents a reduction of the electrical power requirements (cable gauge, power conditioning,
etc.) for substantial savings.
Speaker outputs
LA2Xi features two female 4-point terminal blocks for loudspeaker outputs.
The terminal blocks can be used in a single-ended (SE) conguration, a bridge-tied load (BTL) conguration, or a parallel
bridge-tied load (PBTL) conguration. Bridging the connectors improves maximum SPL, but reduces the maximum number
of loudspeaker enclosure per output and per amplied controller (refer to the Preset guide or the Amplication
reference technical bulletin for more information on enclosure drive capacity).
Maximum SPL
Peak level measured at 1 m, under free eld conditions for full range loudspeakers and half space conditions for
subwoofers, using pink noise with crest factor 4 (preset specied in brackets).
LA2Xi
SE BTL PBTL LA4X LA8 LA12X
X4i ([X4]) 116 dB — — 116 dB
5XT ([5XT]) 121 dB — — 121 dB
X8 ([X8]) 125 dB 129 dB — 129 dB
X12 ([X12]) 131 dB 136 dB — 136 dB
X15 HiQ ([X15]) 133 dB — — 138 dB
Syva ([SYVA]) 130 dB 137 dB — 137 dB
ARCS Wide ([ARCS_WIFO]) 131 dB 137 dB — 137 dB
ARCS Focus ([ARCS_WIFO]) 133 dB 139 dB — 139 dB
A10(i) Wide ([A10]) 133 dB 137 dB — 137 dB
A10(i) Focus ([A10]) 136 dB 140 dB — 140 dB
A15(i) Wide ([A15]) 136 dB 141 dB — 141 dB
A15(i) Focus ([A15]) 139 dB 144 dB — 144 dB
Kara II ([KARA II 70]) 137 dB — — 142 dB
Kara(i) ([KARA]) 136 dB — — 141 dB
Kiva II ([KIVA II]) 133 dB 138 dB — 138 dB
KS28 ([KS28_100]) 136 dB — 143 dB — — 143 dB
SB28 ([SB28_100]) 136 dB — 142 dB — 142 dB
KS21(i) ([KS21_100]) 131 dB 138 dB — 138 dB
SB18(i) ([SB18_100]) 133 dB 138 dB — 138 dB
SB15m ([SB15_100]) 131 dB 137 dB — 137 dB
12 LA2Xi owner's manual (EN) version 1.0

Technical description
LA2Xi
SE BTL PBTL LA4X LA8 LA12X
Syva Low ([SYVA LOW_100]) 131 dB — — 137 dB
Syva Sub ([SYVA SUB_100]) 123 dB 128 dB — 128 dB
Speaker protection
The L-DRIVE transducer protection system provides a dual analysis of both signal intensity and voltage in real-time and
RMS. Under extreme conditions, when component membranes reach the over-excursion zone or if the coil temperature
reaches a critical point, L-DRIVE is activated and acts as a power regulator.
As a result, the amount of power delivered at any channel is adjusted to the dynamic and thermal capacity of each
individual transducer.
Monitoring and control
User interface
The LED display provides real-time monitoring functionalities:
• power
• L-NET network
• status
• mute, level, limit, clip, and error for each output
Refer to section Operation (p.25) for detailed operating instructions.
L-NET remote control network
Remote control of processors and amplied controllers requires setting up a private local area Ethernet network to
interconnect up to 253 units (and additional devices such as Ethernet switches / AVB bridges) with a single control
computer. This Ethernet network, called L-NET, uses L-COM PROTOCOL, a proprietary communication protocol based on
TCP/IPv4.
The integration of the L-NET Ethernet-based network, with its high speed data transfer protocol up to 1 Gb/s, allows up to
253 amplied controllers to be controlled and monitored in real-time from LA Network Manager.
Multiple network topologies such as daisy-chain, star, and hybrid are congurable. The computer running LA Network
Manager and the amplied controllers are connected to each other using industry standard CAT5e U/FTP cables (or
higher category) tted with RJ45 connectors.
The LA2Xi connects to the network via the two Ethernet etherCON I/O sockets located on its rear panel.
Refer to the LA Network Manager Help for detailed operating instructions.
Third party management solutions
L-Acoustics provides SNMP support to facilitate the integration via third-party control and monitoring systems.
L-Acoustics is a certied member of the Crestron® and Extron® partner programs, and provides software modules allowing
control integration into their automation systems.
L-Acoustics provides a plug-in for control and monitoring of LA2Xi, LA4X and LA12X on the QSC Q-SYS platform.
LA2Xi owner's manual (EN) version 1.0 13

Inspection and preventive maintenance
Inspection and preventive maintenance
How to do preventive maintenance
Inspect the product periodically as indicated, and after any corrective maintenance operation.
Structure and cleanness
Before and after each deployment (touring applications), or at least once a month (xed installations):
•External structure (p.14)
•Cleanness (p.15)
Functionalities
At least once a year:
•Normal start-up sequence (p.15)
•Network functionalities and rmware (p.15)
External structure
The indicates a visual inspection.
side brackets are present and not damaged front grills are clean and not damaged
see also Cleanness (p.15)
chassis, and LEDs are not damaged connectors are not damaged
14 LA2Xi owner's manual (EN) version 1.0

Inspection and preventive maintenance
Cleanness
Equipment
• air blower
Procedure
Clean the amplied controller through the front grill with an air blower.
Normal start-up sequence
Procedure
1. Plug the amplied controller to mains.
2. Check that all the LEDs lit during the start-up sequence.
Network functionalities and rmware
Equipment
• computer with LA Network Manager version 3.2.1 minimum
• CAT5e U/FTP cable
Procedure
1. Connect the Ethernet port 1 of the amplied controller to an Ethernet port of a computer running LA Network
Manager.
Use the CAT5e U/FTP cable.
2. Run LA Network Manager.
3. Check that the amplied controllers are detected as online Units.
Refer to the LA Network Manager Help.
4. Check that all LA2Xi in the system run the same version of the rmware, and that it matches with the version of LA
Network Manager in use.
Refer to the LA NWM and Firmware Compatibility Issues technical bulletin.
5. If convenient, update LA Network Manager and the rmware to the latest versions.
If using a third-party control system such as Crestron or Extron, check that updating rmware does not break
compatibility.
LA2Xi owner's manual (EN) version 1.0 15

Installation
Installation
Mounting
The LA2Xi is one rack units high (1U) and can be mounted in an EIA-standard 19” rack using the four points on the front
panel. Use the xing material provided by the rack manufacturer to mount the amplied controller to the rack front rails.
LA2Xi dimensions
483 mm / 19 in
44.45 mm / 1.75 in 32 mm / 1.25 in
465 mm / 18.3 in
265 mm / 10.43 in
435 mm / 17.13 in
248 mm / 9.76 in
LA2Xi is not compatible with L-Case.
Ventilation
To maintain moderate operating temperatures, the LA2Xi is equipped with fans and grills providing front to rear airow.
Ventilation instructions
Install the controller in an open area so that the front and rear panels are located at a minimum distance of
30cm / 12 inches from any external object or structure.
Ensure the front grill is clean and dirt free.
Do not block the front and rear ventilation grills.
Ventilation when rack-mounted
Do not block the ventilation grills with front or back panels or doors. If not possible, use a forced-ventilation
system.
When stacking more than one controller in a rack, mount them directly on top of each other or close any open
space in the rack with blank panels.
16 LA2Xi owner's manual (EN) version 1.0

Installation
General Purpose I/O (GPIO)
The amplied controller's rear side features a 10-point terminal block General Purpose I/O (GPIO).
OUT
+12V
GND
GPIO
1 2 3 4 PAR
GND ground
1
2
3
4
input or output
PAR Connect to a chassis ground pin for PBTL bridging. Refer to Speaker
(p.24).
chassis ground
chassis ground
OUT +12V Used to power a contact relay, 45 mA maximum.
chassis ground
GPIO can be congured using LA Network Manager. For more information, refer to the LA Network Manager Help.
Connecting to AC mains
Electrical specications
AC mains specications
Verify the electrical conformity and compatibility of the mains supply.
Only connect the product to an AC power outlet rated 100-240 V, 50-60 Hz, with the following current values:
100-120 V: 20 A
200-240 V: 10 A
WARNING: The product is of Class 1 construction and shall be connected to a mains socket outlet with a
protective connection to earth.
Three-phase circuit
When the product is used in a three-phase circuit, verify the electrical conformity and
compatibility of the three-phase circuit.
Verify that the three phases work, and balance the loads between the three phases.
Verify that the neutral and earth work.
Never try to emulate a 230 V circuit connecting an apparatus to two live wires of a 120 V three-phase circuit.
LA2Xi owner's manual (EN) version 1.0 17

Installation
Never try to emulate a 200 V circuit connecting an apparatus to two live wires of a 100 V three-phase circuit.
Circuit breaker
Always interconnect a Class C circuit breaker between the product and the mains supply.
The circuit breaker current rating depends on the mains voltage rating, as follows:
100-120 V: 20 A
200-240 V: 10 A
Planning the power of the electrical generator
Electrical generator
You must power on the generator before powering on the product.
LA2Xi draws up to 10 A from 230 V.
A typical generator has a power factor of 0.8 and should operate at 70% load for good efciency.
The kVA provision for one LA2Xi should therefore be:
(10 A × 230 V) / (0.8 × 70%) = 4.1 kVA
This calculation is an example using typical values. It can be adapted using the table in section Power consumption
(p.19).
Power cord
The removable power cord is tted with a V-Lock compatible IEC connector at one end, and a country-specic plug at the
other end.
type plug cable ratings live neutral ground
CE CEE7/VII, earthed 10 A / 250 V
CN GB 2099, earthed 10 A / 250 V brown blue green/yellow
JP JIS 8303, earthed 12 A / 125 V green/yellow
US NEMA 5-15, earthed 10 A / 125 V black white green
Strictly apply the specic safety regulations of the country of use.
Do not defeat the ground connection of the supplied power cord using an adaptor or any other methods.
If the power plug does not match the local power outlet, have a qualied electrician wire a suitable plug.
Verify that the plug conforms to the specic voltage and current rating given in section Electrical specications
(p.17).
Plugging the amplied controller
How to plug the amplied controller to the AC mains.
Procedure
— First, connect the IEC connector to the amplied controller mains panel.
— Then, connect the power plug to the mains socket.
18 LA2Xi owner's manual (EN) version 1.0

Installation
Power consumption
The LA2Xi power requirements depend on the load impedance and the signal level.
Mains input power and current draw (all channels driven)
In SE mode
Maximum output power 4 × 190 W at 16 Ω 4 × 360 W at 8 Ω 4 × 640 W at 4 Ω
1/3 output power (-5 dB) 1.9 A / 330 W 2.9 A / 590 W 3.5 A / 740 W
1/8 output power (-9 dB) 1.2 A / 150 W 1.6 A / 260 W 2.3 A / 430 W
In BTL mode
Maximum output power 2 × 710 W at 16 Ω 2 × 1260 W at 8 Ω
1/3 output power (-5 dB) 2.9 A / 580 W 3.4 A / 710 W
1/8 output power (-9 dB) 1.6 A / 250 W 2.3 A / 440 W
In PBTL mode
Maximum output power 1 × 780 W at 16 Ω 1 × 1400 W at 8 Ω 1 × 2550 W at 4 Ω
1/3 output power (-5 dB) 1.9 A / 320 W 2.9 A / 600 W 3.5 A / 730 W
1/8 output power (-9 dB) 1.2 A / 160 W 1.7 A / 270 W 2.3 A / 440 W
In Idle and Standby (any mode)
Idle 0.5 A / 28 W
Standby 0.4 A / 12 W
Current values given for mains rated at 230 V. Multiply by:
• 2.3 for 100 V
• 1.92 for 120 V
• 1.15 for 200 V
Output power references
A third (1/3) of the maximum output power corresponds to the worst case scenario of a program source using
highly compressed music or pink noise with amplied controller driven to clip level.
An eighth (1/8) of the maximum output power corresponds to a loud music program with a small dynamic range
and 9dB of headroom (IEC standard power rating).
Heat power calculation
If a 4 Ω load is connected to each output channel of the LA2Xi in SE mode, each channel delivers up to 640 W.
With a standard use at one eighth (1/8) of full power (9 dB headroom), the power delivered per channel is:
640 W / 8 = 80 W
Therefore, a total power of:
4 × 80 W = 320 W
According to the table in section Power consumption (p.19), the LA2Xi power consumption is 430 W. The heat power
produced is then (difference between power consumption and output power):
430 W - 320 W = 110 W
24 V DC Input
The amplied controller's rear side features a 2-point terminal block for external powering of the DSP in case of mains
failure.
LA2Xi owner's manual (EN) version 1.0 19

Installation
+24V
IN
GND
The external power supply should be rated 24 V DC (± 10%) 10 W.
Audio and network cabling
Connection panels
The amplied controller's rear side features connectors for audio and network cabling:
1. For connection to the loudspeakers.
2. For connection of the analog and digital (AES/EBU) audio sources, and/or for linking the signals to another
amplied controller.
3. For connection to an AVB network, and to be remotely controlled by LA Network Manager.
LA2Xi audio and network connection panels
1 2 3
Speaker connectors
Use the two female 4-point terminal blocks for loudspeaker connection. The connectors are wired as follows:
left 4-point terminal block both 4-point terminal blocks
SE* BTL* PBTL*
Pin 1+ Out 1+ Out 1+ Out 1+
Pin 1- Out 1- N/A N/A
Pin 2+ Out 2+ N/A N/A
Pin 2- Out 2- Out 2- Out 2-
right 4-point terminal block
SE* BTL*
Pin 3+ Out 3+ Out 3+ Out 3+
Pin 3- Out 3- N/A N/A
Pin 4+ Out 4+ N/A N/A
Pin 4- Out 4- Out 4- Out 4-
*SE: single-ended. BTL: bridge-tied load. PBTL: parallel bridge-tied load. Refer to Speaker (p.24).
20 LA2Xi owner's manual (EN) version 1.0