L-Acoustics LA4X User Manual
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L-Acoustics LA4X User Manual

Amplified controller
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Summary of Contents for L-Acoustics LA4X

  • Page 1 LA4X user manual (EN)
  • Page 2 Document reference: LA4X user manual (EN) version 9.1 Distribution date: November 16, 2016 © 2016 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...

  • Page 3: Table Of Contents

    Contents Safety................................5 Important safety instructions........................5 Additional important safety instructions....................... 6 Symbols..............................7 System components.............................9 Technical description............................10 Main features............................10 Internal components........................10 Front and rear panels........................10 Signal processing............................11 Signal inputs..........................11 DSP architecture..........................12 Power supply and amplier section....................13 Speaker outputs..........................13 Speaker protection........................
  • Page 4 Powering off............................27 Setting to standby mode..........................28 Interpreting the front panel LEDs.......................28 STATUS............................28 L-NET............................28 Meters............................29 OUT.............................29 Main screen description.......................... 30 Using quick access functions........................31 Locking/Unlocking the front panel....................31 Muting/Unmuting an output channel....................31 Modifying gain..........................32 Identifying an amplied controller....................32 Displaying input level, input selection, input mode and group information...........

  • Page 5: Safety

    Pour déconnecter complètement l'appareil du secteur, débranchez la prise de la che secteur. 17. The main plug of the power supply cord shall remain readily accessible. La prise principale du cordon d'alimentation doit rester totalement accessible. LA4X user manual (EN) version 9.1...

  • Page 6: Additional Important Safety Instructions

    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.

  • Page 7: Symbols

    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. LA4X user manual (EN) version 9.1...
  • Page 8 Presentation The LA4X is an amplied controller based on a 4-input by 4-output architecture and an exclusive green power module providing maximized efciency. With LA4X, L-Acoustics speakers can get all the benets of self-powered speakers, while keeping the versatility of the separated amplication approach.

  • Page 9: System Components

    System components A complete L-Acoustics system includes loudspeaker enclosures, amplied controllers, cables, rigging system, and software applications. The main components of an L-Acoustics system that includes LA4X are the following: Loudspeaker enclosures Refer to the user manuals of the loudspeaker systems for detailed instructions about the enclosures and their connection to the amplied controllers.

  • Page 10: Technical Description

    Main features Internal components The core of the LA4X is a DSP engine driving four channels of amplication from four inputs. The LA4X also features a ash memory for preset storage and management, high performance A/D-D/A converters and AES/EBU inputs for audio signals, a universal SMPS (Switched Mode Power Supply) with PFC (Power Factor Correction), a front panel user interface, and a 1 Gb/s dual port Ethernet device for networked remote control.

  • Page 11: Signal Processing

    Analog inputs The LA4X can be fed with up to four balanced analog audio signals using XLR female input connectors ANALOG IN A to ANALOG IN D — see illustration in section Front and rear panels (p.10).

  • Page 12: Dsp Architecture

    — 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) Audio path parameters...

  • Page 13: Power Supply And AmpliEr Section

    100 % of the electrical power available with a very high tolerance to unstable mains. The PFC allows the LA4X to deliver as much power from a 10 A line as from a 16 A line on a conventional amp.

  • Page 14: Installation

    Mounting The LA4X is two rack units high (2U) 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 controller to the rack front rails.

  • Page 15: Ventilation

    Installation Ventilation To maintain moderate operating temperatures, the LA4X is equipped with two fans 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 from any external object or structure.

  • Page 16: Planning The Power Of The Electrical Generator

    LA4X draws 10 A max 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 LA4X should therefore be: (10 A x 230 V) / (0.8 x 70%) = 4.1 kVA This calculation is an example using typical values.

  • Page 17: Plugging The AmpliEd Controller

    Heat power calculation If a 4 Ω load is connected to each output channel of the LA4X, each channel delivers up to 1000 W. With a standard use at 1/8 of full power (9 dB headroom), the power delivered per channel is: 1000 / 8 = 125 W, so a total power of 4 x 125 = 500 W.

  • Page 18: Audio And Network Cabling

    — an L-NET panel (3) to connect to a network and be remotely controlled by LA Network Manager LA4X audio and network connection panels Speaker panel The four 4-point SpeakON connectors on the rear panel are for loudspeaker connection. They are wired as follows:...
  • Page 19 (1 channel) analog audio source (1 channel) AES/EBU digital audio source (2 channels) not used Each LINK connector is wired to the corresponding IN connector, and thus transports the same type of signal. LA4X user manual (EN) version 9.1...
  • Page 20 L-NET panel The two etherCON connectors are for the remote control of LA4X over an Ethernet network called L-NET using LA Network Manager. Each of the two etherCON connectors can be equally used as an IN or a LINK connector.

  • Page 21: Analog Audio

    In a daisy-chain layout, the male XLR link connectors LINK A to LINK D feed the input signals to the next amplied controller in the signal chain. Daisy-chaining analog audio IN A IN B IN C IN D LINK A LINK B LA4X user manual (EN) version 9.1...

  • Page 22: Digital Audio

    In a daisy-chain layout, the male XLR link connectors LINK A&B and LINK C&D feed the input signals to the next amplied controller in the signal chain. Daisy-chaining digital audio IN A&B IN C&D LINK A&B LA4X user manual (EN) version 9.1...

  • Page 23: L-Net

    Ethernet ports of different capabilities, creating detection issues in LA Network Manager. To connect LA4X to L-NET in a daisy-chain, star or hybrid topology, use the etherCON connectors on the L-NET panel. Refer to the LA Network Manager video tutorial for network setup.
  • Page 24 Connecting 3-way active enclosures 3-way active enclosure on speakON output - custom speakON to PA-COM interface L-Acoustics does not supply the speakON-to-PA-COM interface. It must be built with two 4-point speakON connectors and a female 8-point PA-COM connector (no cable clamp).
  • Page 25 Connect the reversed subwoofer(s) to OUT 1 to use the cardioid preset. Subwoofer on speakON output - SP OUT1 OUT3 OUT4 OUT2 Subwoofer on speakON output - SP + SP-Y1 CH1 (OUT1) SP-Y1 CC4FP OUT1/OUT2 OUT3/OUT4 CH2 (OUT2) same as OUT1/OUT2 LA4X user manual (EN) version 9.1...
  • Page 26 X15 HiQ Active 12XT Passive 12XT 115XT HiQ Maximum number of constant curvature WST enclosures per LA4X Loudspeaker enclosure Maximum number of Maximum number of connections per output* enclosures per controller ARCS Wide / ARCS Focus...

  • Page 27: Operation

    Powering off the amplied controller does not disconnect it from mains. Power loss If power is lost, the amplied controller shuts down, but all parameters are restored when the amplied controller switches on again. LA4X user manual (EN) version 9.1...

  • Page 28: Setting To Standby Mode

    The STATUS LED on the front panel displays the state of the amplied controller. — green: when the LA4X operates normally — red: during rmware update or when a fault is detected in the LA4X circuitry, indicating a protection system is active. Refer to Error messages (p.53)

  • Page 29: Meters

    0.8 A The four OUT LEDs on the front panel display the mute status. — white: when the corresponding output channel is muted — off: when the corresponding output channel is unmuted LA4X user manual (EN) version 9.1...

  • Page 30: Main Screen Description

    D: IN D C+: sum of IN C and IN D (C+D) C-: difference between IN C and IN D (C-D) X: sum of IN A, IN B, IN C and IN D (A+B+C+D) LA4X user manual (EN) version 9.1...

  • Page 31: Using Quick Access Functions

    — To mute an output channel: press the corresponding OUT key for less than 0.3 seconds. The screen displays MUTE OUT and the mute status of each output channel for 2 seconds. Example: unmuting OUT1 MUTE OUT Gain can be set before unmuting. LA4X user manual (EN) version 9.1...

  • Page 32: Modifying Gain

    On the Workspace of LA Network Manager, the amplied controller blinks in yellow. On the amplied controller, the L-NET and OUT LEDs ashes and the screen displays IDENTIFICATION and the complete IP. IDENTIFICATION 192.168. 1.110 LA4X user manual (EN) version 9.1...

  • Page 33: Displaying Input Level, Input Selection, Input Mode And Group Information

    ANALOG signals. Input mode cannot be different between IN A and IN B or between IN C and IN D (3) — Channels OUT1 and OUT2 are assigned to the same set of groups, OUT3 is not assigned to any group, and OUT4 is assigned to group All (4) LA4X user manual (EN) version 9.1...

  • Page 34: Using The Main Menu

    A page is selected when it is displayed on the rst line of the screen. 3. Press the OK key or the encoder wheel to enter the page. To return to the main screen, press the ESC key. LA4X user manual (EN) version 9.1...

  • Page 35: Load Preset

    1 to 10 (read and write) User presets stored by user — refer to STORE PRESET (p.37) LOAD PRESET FACTORY 11 to 199 (read only) Factory preset library created by L-Acoustics and automatically installed during rmware update (refer to the LA Network Manager video tutorial) LA4X user manual (EN) version 9.1...
  • Page 36 L-NET network. Press the ESC key twice to cancel. LA4X user manual (EN) version 9.1...

  • Page 37: Store Preset

    Pressing the encoder wheel after the 16th character sets the cursor back to the rst character. 5. Press the OK key to validate the name. The controller displays OVERWRITE?, when the selected memory space is not empty. Press the OK key to overwrite (or the ESC key to cancel). LA4X user manual (EN) version 9.1...

  • Page 38: Delete Preset

    Delay is adjustable from 0 to 1000 ms — see also section DELAY UNIT (p.48). Total delay The total delay includes all group delays (set in LA Network Manager) and the output channel delay. Total delay cannot exceed 1000 ms. LA4X user manual (EN) version 9.1...
  • Page 39 7. Repeat steps 2 to 5 for each preset parameters. Preset parameter modications apply immediately. Saving preset parameters Preset parameter modications are not automatically saved and are lost if the preset is reloaded. Refer to STORE PRESET (p.37). LA4X user manual (EN) version 9.1...

  • Page 40: Clear Group Params

    LA Network Manager (in standalone mode), and when the amplied controller is shut down or restarted. Group parameters are not preset-dependent and remain active when a different preset is loaded. Therefore, L-Acoustics recommends to clear group parameters when an amplied controller is used in standalone mode after being used within a network.

  • Page 41: Input Settings

    5. Turn the encoder wheel to select between the input modes (ANALOG for analog audio source, AES/EBU for digital audio source). 6. Press the OK key or the encoder wheel to validate. 7. Repeat steps 3 to 6 for the other channel pair. LA4X user manual (EN) version 9.1...
  • Page 42 LOCK 44k1 Procedure 1. From the INPUT MODE AB menu, press the OK key. 2. Turn the encoder wheel to select the input mode. 3. Press the OK key or the encoder wheel to validate. LA4X user manual (EN) version 9.1...
  • Page 43 4. Press the OK key or the encoder wheel to validate. 5. Turn the encoder wheel to select the setting (ON or OFF). 6. Press the OK key or the encoder wheel to validate. LA4X user manual (EN) version 9.1...
  • Page 44 5. Turn the encoder wheel to select an input value. Setting applies in real-time. Turn the encoder wheel for steps of 0.1 dB. Press and turn the encoder wheel for steps of 1 dB. 6. Release the key. LA4X user manual (EN) version 9.1...

  • Page 45: Monitoring & Info

    MONITORING & INFO (p.45), the temperature of channels OUT 1 to OUT 4 is respectively 52, 53, 50, and 48 % of the maximum values. Refer to Error messages (p.53) for information on the temperature-related messages. LA4X user manual (EN) version 9.1...
  • Page 46 ETHERNET LINKS displays the current status of the link of each Ethernet port. This function is only available on LA4X with 1 Gbit/s Ethernet ports. Refer to the Networking and control of LA4X with 1 Gbit/s Ethernet ports technical bulletin for more information.

  • Page 47: Options

    4 bytes. In class C private local area IP subnets, the three rst bytes are the network prex and the last byte is the device identier on the subnet. Regarding device identiers, two numbers are reserved: 0 to designate the subnet, and 255 to communicate with all devices of the subnet (the IP broadcast address). LA4X user manual (EN) version 9.1...
  • Page 48 Turn the encoder wheel to select a value. c) Press the OK key to validate. d) In LA Network Manager: 1. Click the L-Acoustics logo and select Options. 2. Enter the corresponding values in IP Range to scan for L-NET. DELAY UNIT Delay values can be displayed in ms (milliseconds), meters, feet or samples.
  • Page 49 4. Press the OK key or the encoder wheel to validate. 5. Turn the encoder wheel to select the value (OFF, LOW, MEDIUM, NORMAL or SUNLIGHT. 6. Press the OK key or the encoder wheel to validate. LA4X user manual (EN) version 9.1...
  • Page 50 The amplied controller displays RESET AMP TO FACTORY, ARE YOU SURE?. 5. Press the OK key or the encoder wheel to validate (or the ESC key to cancel). The amplied controller launches the start-up sequence. When complete, the amplied controller displays the main screen. LA4X user manual (EN) version 9.1...

  • Page 51: Settings Protection

    PIN code to temporarily bypass the protection or press the ESC key to cancel ACCESS ENTER PIN: LOCKED Entering a PIN code ENTER PIN: OUT1 + ENTER PIN: OUT2 + ENTER PIN: OUT3 + ENTER PIN: OUT4 + ENTER PIN: LA4X user manual (EN) version 9.1...
  • Page 52 5. Press the OK key or the encoder wheel to validate. If the controller returns to the ENTER PIN screen, the entered PIN code is wrong. Repeat step 1 to 5 with the right PIN code, or press the ESC key to cancel. LA4X user manual (EN) version 9.1...

  • Page 53: Maintenance

    The channel is muted. The channel is automatically unmuted when the issue is solved. If the error persists after disconnecting all cables and rebooting, the controller must be sent to an L-Acoustics representative for maintenance. Output channel internal error messages The output channels are continuously monitored for internal errors.

  • Page 54: Other Messages

    (bare lead version of the power cable) repair kit newton meter, international torque unit, 1 N.m = 9 in lbf SMPS Switched Mode Power Supply (power supply inside of the amplied controller) United States LA4X user manual (EN) version 9.1...

  • Page 55: SpeciCations

    > 0.9 (4 Ω full power) mains rating 100 - 240 V~ ±10%, 50-60 Hz operating conditions temperature room temperature (from 0º C / 32º F to +50º C / 122º F) LA4X user manual (EN) version 9.1...

  • Page 56: Input Signal Distribution

    Neutrik are registered trademarks of Neutrik AG Analog Input input impedance 22 kΩ (balanced) maximum input level 22 dBu (balanced, THD 1%) A/D conversion four cascaded 24-bit analog/digital converters (128 dB dynamic range) LA4X user manual (EN) version 9.1...

  • Page 57: Digital Input

    -12 dB to +12 dB steps 0.1 dB Latency analog and AES/EBU in standard operating mode 3.84 ms (independent from input Fs) in low latency operating mode 0.76 ms (independent from input Fs) LA4X user manual (EN) version 9.1...

  • Page 58: Physical Data

    90 - 265 VAC / 50-60Hz / 1500 LINK/AC AES/EBU IN C& LINK C& OUT 2 OUT 4 ANALOG IN LINK ANALOG IN LINK 1+1- 1+1- 420 mm / 16.5 in 13 mm / 0.5 in 434 mm / 17 in LA4X user manual (EN) version 9.1...

  • Page 59: Approvals

    Approvals Approvals LA4X user manual (EN) version 9.1...
  • Page 60 L-Acoustics, an L-Group Company 13 rue Levacher Cintrat - 91460 Marcoussis - France +33 1 69 63 69 - info@l-acoustics.com www.l-acoustics.com L-Acoustics GmbH L-Acoustics Ltd. L-Acoustics Inc. Steiermärker Str. 3-5 PO. Box Adler Shine - Aston House 2645 Townsgate Road, Suite 600...

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