LA-600 - AVSL Group
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1. O adastra LA 600 LOOP AMPLIFIER Item ref 952 867UK User Manual S adastra LA 600 INDUCTION LOOP AMPLIFIER INPUTS www avsl adastra com an any group brand 0 adastra T Caution Please read this manual carefully before operating Damage caused by misuse is not covered by the warranty SAFETY SYMBOL AND MESSAGE CONVENTIONS CAUTION AVIS RISK OF ELECTRIC SHOCK RISQUE DE CHOC ELECTRIQUE NE PAS DO NOT OPEN OUVRIR This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit AN SAFETY NOTICE Prior to use read through this manual Keep the manual in good condition Pay attention to safety warnings Observe all operating requirements Do not use the device near water or wet areas For cleaning only use a lint free dry cloth Install according to the specifications Place away from heat sources or heating appliances Use mains lead provided and avoid damage to cable or connectors 10 Unplug power from mains during stormy weather or if unused for long periods 11 In case of malfunction water ingress or other damage consult qualified service personnel 12 Do not place in damp areas or near liquids or moisture Do not spill liquids on the housing 13 Please pay attention to warning symbols during transit and placement 14 Terminals marked with the t symbol are HAZARDOUS LIVE and should only be connected by qualified personnel 15 Ensure that the app2. al length of the cable run The LA 600 is designed to operate with a load of between 0 29 and 2Q The following equation can be used to calculate the total cable resistance which will show if the gauge is correct R Cable length m x 0 0178602 mm2 m specific resistance of Copper Cable CSA mm So for a cable 80m long with a Cross Sectional Area CSA of 1 5mm2 R 80 1 5 x 0 01786 0 9525 So this gauge of wire 1 5mm would be OK for the 80m run because it is between 0 29 and 2Q As a quick reference refer to the table below Cable CSA mm Total Loop Length Over 200m The wire may be run in plastic conduit but not in any metal containment so as not to impair the magnetic flux The ideal height to install the cable depends upon the width of the loop i e the narrowest dimension relative to the listener The optimum output will be achieved if the cable is installed 14 of the loop width higher or lower than the plane of listening ear height In practical terms the loop is usually installed onto skirting boards under flooring or at ceiling height so that it is unobtrusive It is recommended to avoid varying height levels as much as possible to avoid anomalies in field strength For irregular shaped areas or larger than 600m2 multiple induction loops may be required for coverage Connecting further LA600 amps using the Slave connection will enable multiple loops to be used together Loop amplifier 1 Slave link Mag
3. aratus is connected to a mains socket with a protective EARTH connection 16 Ensure correct operation of the mains switch ee RA A E al Warning To prevent the risk of fire or electric shock do not expose any components to rain or moisture If liquids are spilled on the casing stop using immediately allow unit to dry out and have checked by qualified personnel before further use Avoid impact extreme pressure or heavy vibration to the case No user serviceable parts inside Do not open the case refer all servicing to qualified service personnel Safety Check for correct mains voltage and condition of IEC lead before connecting to a power outlet Use insulated loop wire ensuring the correct gauge for the loop distance required Do not allow any foreign objects to enter the case or through the ventilation grilles Placement Use the mounting ears supplied when installing into a 19 rack For rack mounting ensure adequate support for the weight of the amplifier Ensure adequate air flow and do not cover cooling vents at the front and rear of the amplifier e Ensure adequate access to controls and connections Cleaning Use a soft cloth with a neutral detergent to clean the casing as required Use a vacuum cleaner to clear ventilation grilles of any dust or debris build ups Do not use strong solvents for cleaning the unit 952 867UKUser Manual 0 adastra Introduction Thank you for choosing the Adast
4. ected signals are at maximum level the Peak Current indicator does not show overloading It is recommended to use an induction loop receiver 952 855UK to check the audio from the induction loop Adjust the Loop Current control to set the main audio level from the induction loop The Metal Loss Correction control 18 enhances higher audio frequencies which may be absorbed by metal architectural features and appliances within the induction loop area If the building has a lot of metal structure or reinforced concrete in the vicinity of the loop use this control to adjust the audio quality of the loop signal Adjust Bass and Treble controls 4 5 to set the tonal characteristics of the audio from the induction loop The mid point 12 o clock is the zero position Turning to the left of the mid point will cut Bass or Treble and to the right of the mid point will boost Bass or Treble When the induction loop is not required ensure that no hearing aid users are remaining within the loop area and switch off the loop amplifier leaving the settings in position will ensure that the induction loop is set up correctly for the next usage 952 867UKUser Manual 0 adastra Specifications T2A 250V Troubleshooting bele earn wien Check that the mains fuse is not blown refer to qualified service personnel If the fuse is blown check that the loop contacts were not shorted out Check input connections are OK and that a signal is pr
5. esent on the input Peak current indicators are Pa Check that the loop is intact and connected to the amplifier properly not showing any signal Check mains is connected and switched on at the socket Increase channel level controls and Loop current if necessary Dead spots within Check for large metal structures within the architecture close to the loop induction loop field Avoid changes in height of the loop cable running over door frames etc other audio equipment If necessary form a cancellation loop to avoid affecting other equipment Siren activated Peak indicators mainly showing overload red Loop current is very low Poor quality audio from the loop Loop field interfering with Ensure that the loop cable is twisted between the loop and the loop amplifier Electronic equipment and should not be disposed with other household or commercial waste at the end of its useful life C X Disposal The Crossed Wheelie Bin symbol on the product means that the product is classed as Electrical or i The goods must be disposed of according to your local council guidelines Errors and omissions excepted Copyright 2015 AVSL Group Ltd 952 867UKUser Manual
6. nds or shorted connections See below for details about installing the loop wire before connecting mains power to the LA600 S 7 C Ey D LOAD IMPEDANCE 0 20 min 20 max Mains is connected to the LA600 via the rear panel IEC connector 11 with a built in mains fuse Use the supplied lead and ensure that the correct mains voltage is set on the voltage selector 10 952 867UKUser Manual 0 adastra Induction loop cable installation Prior to installation it is important to check if there will be any equipment in the vicinity that may interfere with the loop s magnetic field such as large transformers high power cables or substations It is also important to ensure that no equipment will be adversely affected by the loop field such as sensitive data or Signal cables In these cases it may not be possible to cover some or any of the required area with an induction loop The LA600 can cover an area up to 600m in ideal conditions The cable gauge will depend upon the total length of the induction loop Usually the loop will be installed around the perimeter of the listening area However there are various techniques which can be employed to build arrays to vary the shape and strength of the field In general calculations outlined here are based upon a perimeter installation It is recommended to use good quality insulated pure copper cable for the induction loop The cable gauge used will need to be determined by the tot
7. netic field Loop amplifier 2 952 867UKUser Manual 0 adastra Cancellation Loops If there are areas adjacent to the loop where the magnetic field would cause problems it is possible to avoid this by use of a cancellation loop which is a narrow loop parallel to the main loop at the problem area This loop is the opposite polarity to the main loop and causes the magnetic field to narrow along the adjacent edge of the main loop to control the spill of the loop field Main loop Loop amplifier Cancellation loop Magnetic field strength Connection Connect any line sources e g CD player mp3 player or microphones to one or more of the input channels If a microphone is connected select MIC on the DIP switches and connect via the 6 3mm jack or XLR input If the microphone is a condenser microphone requiring phantom power select PHANTOM For standard dynamic and battery powered microphones set the Phantom switch to OFF For line inputs select LINE on the DIP switches For channel 1 there is an option for PRIORITY over the other two channels which will mute the output of channels 2 and 3 when there is an input to channel 1 If the loop amplifier is to be used in conjunction with a PA system with loudspeakers connect the line or aux output from the PA system to a Line input on the loop amplifier via RCA jack or XLR connection Ensure that this input is set to LINE and Phantom is set
8. ra LA600 induction loop amplifier for your assisted hearing installation This unit is designed to offer high quality dependable service for areas up to 600m2 Please read this manual fully and follow the instructions to achieve the best results with your new purchase and to avoid damage through misuse Note All induction loops in the UK should be installed in accordance with BS7594 Front panel O adastra 3 4 n 5 n D n 7 oe B LA 600 INDUCTION LOOP AMPLIFIER Q o O 0000 O SIREN PEAK CURRENT MASTER Q Q Q Q Q Q 10 10 10 BLE LOOP CURRENT 10 0 Ca Ce 2 Ci 3 BASS TRE gt 1 2 3 4 5 6 7 8 9 1 Channel 1 input level control 6 Loop current master level control 2 Channel 2 input level control 7 Siren indicator 3 Channel 3 input level control 8 Loop current level indicator 4 Bass EQ adjustment 9 Power switch and indicator 5 Treble EQ adjustment Rear panel LOOP OUTPUT CABLE SELECTION ol O ABE wo is as 4 gi Ee b LOOP O TPUT ALARN CONTACTS A 240W LOAD IMPEBANCE 0 20 nfin 20 max 4A 110V 10 11 12 13 14 15 16 17 10 Mains voltage selector 15 Unbalanced RCA inputs 11 Combined IEC mains inlet and fuse holder 16 Mic line level phantom amp priority DIP switches 12 Loop output terminals 17 Combined Slave input output 13 Alarm contact terminals 18 Metal loss correction adjustment 14 Balanced combo jack XLR inputs 952 867UKUser Man
9. to OFF Before connecting the induction loop to the amplifier use a test meter to check the D C resistance in the wire Ensure that there are no shorted or grounded points in the wire and that the total resistance is not less than 0 50 Twist the loop wires from where the loop ends to the amplifier terminals to avoid creating an extended loop to the area where the amplifier is situated With the power switched off 9 connect the loop cable to the loop terminals 12 on the rear panel of the loop amplifier 952 867UKUser Manual O adastra Operation The front panel controls on the LA 600 loop amplifier are recessed and can be adjusted using a flat blade screwdriver This is to avoid tampering or mal adjustment after the correct settings have been applied Where new or unsupervised operators are making adjustments to equipment in the venue they may not be aware if they have adjusted the induction loop settings unless they themselves are a hearing aid user Set the Ch 1 Ch 2 Ch 3 and Loop Current controls 1 2 3 6 to minimum and keep the Bass and Treble controls 4 5 in the mid position 12 o clock Power up the loop amplifier and increase the Loop Current control 6 part way Whilst playing a signal into one of the input channels gradually increase the level 1 2 or 3 until the peak current indicator 8 shows movement The optimum operating level is achieved if the channel level controls are set so that if all conn
10. ual 0 adastra Installation The LA600 loop amplifier can be operated free standing or fitted into a standard 19 rack cabinet using the supplied rack ears Ensure that theLA600 is positioned on a stable surface with adequate cooling ventilation There are 3 input channels which can accept inputs via balanced XLR or 6 3mm jack connection 14 or unbalanced RCA connection 15 The XLR jack connectors can be set to accept microphone or line level via the Mic Line DIP switches 16 which are also accompanied by switches to activate 20V phantom power for use with condenser microphones Multiple LA600 amplifiers can be used in master slave mode using the combined slave input output jack 17 Connecting a stereo 6 3mm plug to this socket gives 2 wiring options as shown below Connecting a mono 6 3mm plug will function as a slave output A TRS plug with signal connected to the ring will be needed for a slave input from another loop amplifier Output to Slave amplifier Input from Master amplifier Alarm contacts 13 are provided which will emit a siren on the induction loop when the connection is made These can be connected to an emergency switch or alarm panel contacts to activate the siren for emergency evacuation indicated by an LED on the front panel 7 Alongside the alarm contacts are the screw terminals for the induction loop 12 Connect the 2 ends of the loop wire to these terminals ensuring no stray stra
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