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L-Acoustics LA4 User Manual
Summary of LA4
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La8 amplified controller user manual version 9.0 w w w . L - a co u s t i cs . Co m.
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 2 safety instructions 1. Read this manual 2. Follow all safety instructions as well as danger and obligation warnings 3. Never incorporate equipment or accessories not approved by l-acoustics ® 4. Re...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 3 14. Lightning storm during lightning storms, disconnect the product from the mains. Switching the product off does not disconnect it from the mains. To do this, remove the plug from the mains outlet. 15. Interconnections when connecting the produ...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 4 symbols indicated on the product the product is potentially life threatening if open. Never attempt to remove the back cover. The lightning flashes symbols next to the speakon ® and ca-com ® connec...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 5 welcome to l-acoustics ® thank you for choosing thel-acoustics ® la8 amplified controller. This document contains essential information on using the product properly. Carefully read this document in order to become familiar with the product. As p...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 6 4.3.7 example of heat calculation ......................................................................................................................... 16 4.4 audio and network cabling ...........
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 7 1presentation at the heart of the l-acoustics ® integrated system approach, the la4 and la8 amplified controllers offer cutting edge loudspeaker amplification, dsp, network control, and comprehensive system protection in a single ergonomic packag...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 8 2system components the system approach developed by l-acoustics ® consists in offering a global solution that guarantees the highest and most predictable level of performance at any step of loudspe...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 9 3la8 amplified controller 3.1 main features 3.1.1 front and rear panels figure 2: la8 front and rear panels 1. Led meters: clip level audio level (-25, -10, -5 db) signal presence load presence 2. L-net network control led 3. Lcd screen 4. Nav./e...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 10 3.1.2 simplified block diagram the core of the la8 is a dsp engine driving four channels of amplification from two inputs. The la8 also features a flash memory for preset storage and management, h...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 11 3.2.2 aes/ebu digital input the la8 can be fed with one aes/ebu digital audio signal carrying two audio channels, thanks to the la-aes3 card. The card features an xlr input port (see figure 2), an active xlr link port, and a sample rate converte...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 12 3.2.3 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 rea...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 13 3.2.4 amplifier section and power supply the la8 amplifier section uses a class d technology supporting the very wide dynamic range found in live audio productions. The 4 channels can deliver up to 4 x 1800 watt into 4 or 2.7 ohm yielding perfec...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 14 4installation 4.1 mounting the la8 is two rack units high (2u) and can be mounted in an eia-standard 19’’ rack (see figure 5). The four points on the front panel are for rack mounting. Use four sc...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 15 4.2 cooling to maintain a low and even operating temperature the la8 contains two fans providing front to rear airflow. Instructions for proper ventilation do not block the front and rear ventilation grills on a controller. Ensure that the front...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 16 4.3.4 electrical generator you must power on the generator before powering on the amplified controllers. Verify that the amplified controllers are turned off before powering the generator on. Plan...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 17 4.4 audio and network cabling 4.4.1 connection panels the la8 rear side features four connection panels (see figure 7): analog for analog audio distribution, aes/ebu for digital audio distribution, speaker output, and l-net for remote control wi...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 18 figure 9: analog input panel wiring balanced cables symmetrical (balanced) shielded cables are highly recommended as balanced signals are less sensitive to ac hum and radio interference. Unbalance...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 19 figure 10: daisy-chaining digital audio figure 11: digital input panel wiring.
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 20 4.4.4 loudspeaker cabling there is a risk of damaging the speakers. Thedo2w, dofill and dosub pa-com ® cables are not compatible with the la8. All other l-acoustics ® pa-com ® cables can be used. ...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 21 the table below describes the maximum number of enclosures a single la8 amplified controller can drive. Table 3: maximum number of enclosures per la8 technology loudspeaker enclosure max number of connections per output * max number of enclosure...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 22 5operation 5.1 powering on, powering off, standby mode press the power switch up to power the la8 on (see figure 13). The la8 goes through a 9-second start-up sequence coming with initializing con...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 23 5.2 display 5.2.1 main screen once the start-up sequence has fully cycled (refer to section 5.1), the lcd displays the main screen: figure 15: main screen 1. Preset memory number (1 to 255) memory space containing the current preset the preset c...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 24 5.2.2 led meters four led meters are located on the front panel above the lcd screen (see figure 16). Figure 16: the four led meters by default the led meters monitor the state of the four output ...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 25 5.3 user interface 5.3.1 quick access the la8 offers quick access functions for control (front panel locking, mute, and gain), identification and monitoring (display of input level, input selection, input mode, and group information). Lock/unloc...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 26 additional information about gain control quick access gain control is only available from the main screen. Gain values can be set at 0.1 db resolution ( simply turn the encoder wheel) or 1 db re...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 27 input level, input selection, input mode and group information press and hold the esc or ok key from the main screen. The led meter and the top line of the lcd screen display information about input channels in a and in b, respectively from left...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 28 5.3.2 main menu the main menu gives access to the pages described in the following table. Please refer to the appropriate sections for detailed instructions. La network manager software all parame...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 29 5.3.3 access rights, pin code the functionalities indicated in the following table can be locked or protected by a 4-digit pin code defined from la network manager (refer to the la network manager video tutorial): table 5: functionalities locked...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 30 5.4 load pst a preset can be loaded from the following menu pages: table 6: load pst pages page memory range contents load pst user 1 – 10 (read and write) user presets stored by the user (refer t...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 31 5.5 store preset the current preset and the possible setting modifications can be stored to a user memory (1-10). Modifications flag the modifications of the preset parameters are indicated by a star sign (on the top right corner of the lcd scre...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 32 5.6 delete preset a user preset contained in a user memory (1-10) can be deleted following these steps (see figure 28): from the main menu select delete preset. If the controller displays no prese...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 33 if necessary all preset parameters (including the preset name) can be reset to default values following these steps (see figure 30): turn the encoder wheel to select reset preset. Press the ok key or the encoder wheel two times (or esc to abort)...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 34 5.8 clear grp params the group parameters (name, gain, delay, and contour eq) defined in la network manager (refer to the la network manager video tutorial) can be cleared. Group and preset parame...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 35 5.9 input settings 5.9.1 input mode this function allows selecting the physical input connector according to the audio source feeding the amplified controller: an analog audio source connects to the in a and/or in b inputs of the analog panel (s...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 36 sound cut can be avoided using the fallback mode on the aes/ebu in input and a backup audio source connected to the analog inputs (refer to section 0). In case of unlock status the analog input wi...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 37 5.9.2 fallback mode an automatic fallback option can be enabled or disabled. When enabled, and when the aes/ebu input mode is selected, the amplified controller will automatically switch from digital to analog input in case of digital signal fai...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 38 5.9.3 aes/ebu gain the aes/ebu input ports include a gain module, common to all ports, which can be set from -12 db to +12 db by 0.1 db steps. It must be used when the fallback mode is enabled, a ...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 39 5.10 monitoring & info this menu provides real-time measurements to monitor the output channels and provides the versions of embedded software. In more details, the monitoring and info menu allows to: display in real-time the rms output voltage ...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 40 5.10.4 preset library this page displays the version of the preset library in use in the controller. For example, figure 38 shows preset library version 4.2. Preset library description refer to th...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 41 5.11.1 network address remote control of amplified controllers requires setting up a private local area ethernet network to interconnect up to 253 units with a single control computer (and possible additional devices such as ethernet switches). ...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 42 5.11.3 screen contrast to set the lcd screen contrast follow these steps: from the main menu select options and press the ok key or the encoder wheel (or esc to abort). Turn the encoder wheel to s...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 43 appendix a: protection systems the la8 electronic vital parts are continuously monitored by the embedded operating system to optimize the power resources while ensuring safety even under extreme conditions. Each time a protection system is activ...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 44 output channels output channel temperature the fans associated to the heat sinks operate permanently, but as long as the temperature remains below 40 °c they run at their slowest speed and can har...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 45 appendix b: approvals ec declaration of conformity l-acoustics ® 13 rue levacher cintrat parc de la fontaine de jouvence 91462 marcoussis cedex france states that the following product: la8 amplified controller. Is in conformity with the provisi...
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La8 amplified controller user manual version 9.0 la8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 46 appendix c: specifications general output power eia (1% thd, 1 khz, all channels driven) 8 Ω 4 or 2.7 Ω 4 x 1100 w rms 4 x 1800 w rms 4 x 1300 w peak 4 x 2500 w peak max output voltage 150 v (peak...
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La8_um_en_9.0 w w w . L - a c o u s t i c s . C o m 47 analog input connectors input link 2 neutrik ® female xlr3, iec 268, esd protected 2 neutrik ® male xlr3, iec 268, esd protected input impedance 22 kΩ (balanced) max input level 22 dbu (balanced, thd 1 %) latency 3.9 ms digital conversion two ca...
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W w w . L - a co u s t i cs . Co m document reference: la8_um_en_9.0 distribution date: october 28, 2014 © 2014 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..