Operating Manual
Contents
1. 240V AC 50Hz OUTPUT REDBACK Fig 2 0 www altronics com au Redback Proudly Made In Australia 7 Setup 2 2 EWIS INPUT The A 4210 12 amplifiers have a dedicated EWIS input for emergency situations A Fire Evacuation System can be configured when the A 4210 12 is complemented with an Emergency Tone Generator or Evacuation Controller such as the Altronics A 4575A as shown in Fig 2 1 The A 4575A controller is designed around industry standard building emergency alert evacuate requirements When connected to a paging system amplifier building occupants can be alerted and or evacuated in the event of an emergency e g Tire gas leak bomb scare earthquake Figure 2 1 demonstrates how to connect the A 4575A controller to the A 4210 12 amplifier The output of the A 4575A Evacuation controller is connected to the EWIS Input of the A 4210 using dual RCA leads The output level of the signal trom the Evacuation controller is set by the EWIS volume adjustment on the front of the A 4210 12 amplifier The A 4210 12 has an in built VOX circuit which is activated when a signal is applied to the EWIS input The VOX sensitivity of the EWIS input is adjusted via the Alert Evac Level trimpot adjustment on the front panel Once the VOX is activated the Mic Line and AUX inputs will be overridden and the audio from the EWIS input will be output See DIP switch settings for more info on enabling the VOX Triggering2. max 20 The A 4210 is suitable for areas of approximately 180 200m2 subject to metal loss and the A 4212 is suitable for areas of approximately 400 650m2 subject to metal loss Note that coverage may vary from site to site depending on outside influences such as steel reinforcement high current electrical wiring etc Inputs are provided for balanced mic and line auxiliary and an EWIS input with VOX muting for interfacing into venue emergency evacuation systems 1 2 FEATURES e Designed to meet AS60118 4 2007 e Coverage up to 180 200m2 for the A 4210 and 400 650m2 for the A 4212 e XLR line amp mic inputs e Aux Input via stereo RCA e EWIS signal connection RCA e Short circuit proof e Compressor for added speech intelligibility e Adjustable VOX sensitivity e Compatible with single loop designs e 240V AC operation e 19 Rack Mount with optional A 4376 rack ears 1 3 WHAT S IN THE BOX A 4210 12 Induction Loop Amplitier 240V AC IEC C13 Appliance Mains Lead 10A 3 Pin Black Instruction Booklet 4 Redback Proudly Made In Australia www altronics com au Overview 1 4 FRONT PANEL GUIDE Fig 1 4 shows the layout of the front panel 10 6 Signal Present 15dB 9dB 6dB 3dB OdB Mic volume control Use this control to adjust the microphone volume Line volume control Use this control to adjust the Line volume Aux volume control Use this control to adjust the Aux volume Ewis volume control Use this
3. control to adjust the Ewis volume Master volume control Use this control to adjust the master volume Power Switch Use this switch to turn the amplifier on On Indicator This LED indicates when the amplifier has power Overtemp Indicator This LED indicates when the amplifier is running hot VU Indicator These LED s indicate the output level of the amplifier Signal Presence Indicator This LED indicates when a signal is present at the inputs of the amplifier www altronics com au DED P 2 80VA Hearing Loop Amplifier 2525 25 a ou ees N A4210 Redback Proudly Made In Australia Overview 1 5 REAR PANEL CONNECTIONS Fig 1 5 shows the layout of the rear panel 10 6 Redback Proudly Made In Australia OUTPUT Made in Australia Altronic Distributors Pty Ltd ae 24V DC FUSE 24V DC FUSE il ap Z 1 240V AC 50Hz Fig 1 5 24V DC Fuse This resettable fuse protects the positive supply rail inside the amplifier Output Connections Connect the loop to these terminals 24V DC Fuse This resettable fuse protects the negative supply rail inside the amplifier Phase switch Not currently available i e inactive Line Input A 3 pin balanced Line level input Mic Input A 3 pin balanced Microphone level input Phantom power is also available on this input see DIP switch settings EWIS input vox sensitivity This trimpot adjusts the Vox sensitivity of the EWIS input Once the VOX is activ
4. dB 1s the actual response at 1 kHz irrespective of where this falls withm the 1 dB tolerance given in D 2 a Figure D 2 EQ or wideband frequency response target curve and tolerances on response Fig 4 0 14 Redback Proudly Made In Australia www altronics com au 4 0 TERMS AND ABBREVIATIONS Terms and Abbreviations Explanations AFILs Audio Frequency Induction Loops Field Strength Magnetic Calibrated Meter to indicate magnetic Field Strength Baseband Audio T C T setting available but normal PPM reads approx 30 higher rms Root mean squared refers to sinewave signal leve H Magnetic Field strength measured in milliAmperes per metre rms Spill Unwanted magnetic signal transmitted outside the loop 5 0 SPECIFICATIONS Measurements referenced to 1kHz lt 0 25 50 drive Loop connection via pluggable terminals 240V ac 432W x 380D x 88H Specifications subject to change without notice 15 www altronics com au Redback Proudly Made In Australia Warranty All Australian made Redback products are covered by a 10 year warranty Should a product become faulty please contact us to obtain a return authorisation number Please ensure you have all the relevant documentation on hand We do not accept unauthorised returns Proof of purchase is required so please retain your invoice Ph 1300 797 007 Fax 1300 789 777 www altronics com au Sydney NSW 15 Short St AUBUR
5. loop which increases the field strength by 6dB however the loop impedance goes up 4 times and increases the risk of the amplifier clipping especially at high frequencies 4 Single Array Loop Two or multiple Tig 8 type segments nominally 2 to 5m preferably all the same width Requires less current than a Perimeter loop 3dB per 2 sections but exhibits a brief but sharp signal Null at each segment or cable crossover Most suitable for a permanent seating areas and individual desks Classroom setup Has limitations as the number of loop segments due to metal loss increases 5 Electric Grill variation of the Perimeter Loop Fitted as continuous sections approx 2m wide giving a more consistent field and lowering spill and improved metal loss performance Uses substantially more cable requires considerations regarding lower resistance cable and potential for cable damage if fitted under floor cladding in heavy traffic area 6 Cancellation Loop Passive In the simplest form a narrow loop added to a Perimeter Loop laid as a tig 8 end of the main loop The design of the extra loop is critical and best fitted by trial and error 7 Ultra Low Spill Array With mathematical Simulation and extremely precise placement of loop components down to lt 50mm an Ultra Low Spill System can be achieved with spill down to approx 1m A site visit for sample test measurements data would enhance the quality of results 3 4 THE
6. A 4575A ALERT EVAC CONTROLLER 240V AC FUSE M205 500mA BROQVHONYNI 30D z A 4210 12 AMPLIFIER OUTPUT L DIP Vox Altronic Distributors Pty Ltd PHASE Switches Sens www altronics com au 424V DC FUSE 24V DC FUSE SHIFT am es a BB Ea When Internal Ewis module fitted 240V AC 50Hz Fig 2 1 Other Emergency Tone Generators A 2070B A 4572 Alert Evac Tone Generator MP3 SD Tone Generator Alert Evac Tone Generator School Lockdown Controller 8 Redback Proudly Made In Australia www altronics com au 2 3 DIP SWITCH SETTINGS These switches configure the phantom power and Vox triggering function Switch 1 Enables the VOX Triggering The VOX is activated when a signal is applied to the EWIS input The VOX sensitivity of the EWIS input is adjusted via the Alert Evac Level trimpot adjustment on the front panel Once the VOX is activated the Mic Line and AUX inputs will be overridden and the audio from the EWIS input will be output Switch 2 Not Used Switch 3 Not Used Switch 4 Sets the phantom power 12V DC The phantom power affects the Mic input Only 2 4 LED STATUS INDICATORS There are a series of LED s on the front panel which indicate the following On Indicates when the amplitier has mains power applied Overtemp Indicates when the amplifier reaches a high temperature The unit will shutdown if this occurs preventing damag
7. AMPLIFIER The preferred amplifier design must incorporate a compressor for reduction of the dynamic range and a limiter to protect the amplifier output trom clipping esp at high trequencies and thus eliminating any risk of generating EMC transmissions i e must comply with C tick requirements It is also preferred that the amplifier has a true current drive output and thus minimizing problems with low impedance and driving an inductive load Plan for the amplifier to have 20 margin The amplifier must be capable of short term delivery of pulsed tone 125mS bursts of current to achieve 400mA m with no distortion see extract from AS 60118 4 2007 Please Note The amplifier s maximum coverage area is measured in a free field situation In reality with metallic objects like reinforced concrete the coverage could be reduced by approximately 20 50 Extract from AS60118 4 2007 Magnetic Field Strength in Audio Frequency Induction Loops for Hearing Aid Purposes The rigorous standard for Au dio Induction Loop Systems making Australia internationally compliant in regard to field strength and audio quality for the hearing impaired This defines the performance criteria of an induction loop system The key elements may be Summarised Field Strength in the specified listening area shall be 20dB re 1A m average i e 100mA metre long term aver age using a 1kHz sinusoidal input with a variation of 3dB short term peaks up to 400mA
8. Australian Made Status All Redback house products made by Altronics will now be sporting the official Australian Made logo Since starting manufacturing of commercial audio equipment in the mid 70 s we have always taken pride in producing a quality local product The new adoption of the Australian Made logo will help us get the word out to local and export markets that our products carry the official compliance seal of the Australian Made campaign We have always pushed our local is better line in all of our marketing efforts it s always an added boost when you are backed up by a widely recognised and respected icon Industry leading 10 year warranty There s a reason we have the industry leading DECADE warranty It s because of a long tried and tested history of bullet proof reliability We ve heard PA contractors tell us they still see the original Redford amplifier still in service in schools that s over 37 years of operation and still going strong Published by Altronic Distributors 2014 Altronic Distributors 2 Redback Proudly Made In Australia www altronics com au 1 0 Overview 1 1 Introduction 1 2 Features 1 3 What s in the box 1 4 Front panel guide 1 5 Rear panel connections 2 0 Setup 2 1 Setup Guide 2 2 EWIS Input 2 3 DIP Switch Settings 2 4 LED status indicators 3 0 Loop Design 3 1 Loop Design Guidelines 3 2 The Loop 3 3 Loop Types 3 4 The Amplitier 3 5 Theoretical Loops 3 6 Practi
9. N NSW 2144 Open Mon Fri 8 30am 5 30pm Sat 9 00am 4 00pm Melbourne Vic 891 Princes Hwy SPRINGVALE VIC 3171 Open Mon Fri 8 30am 5 30pm amp Sat 9 00am 5 00pm Sun 10 00am 4 00pm Brisbane Qld Unit 2 1870 Sandgate Rd VIRGINIA QLD 4014 Open Mon Wed Fri 8 00am 5 30pm Thur 8 00am 8 00pm Sat 8 30am 5 00pm Sun 10 00am 4 00pm Perth WA 174 Roe St PERTH WA 6000 Open Mon Wed Fri 8 00am 5 30pm Thur 8 00am 8 00pm Sat 8 30am 5 00pm Sun 12 00pm 5 00pm Sy WESTALL 1s G1V 4dDZ114 Cannington WA Unit 6 1326 Albany Highway ALT MONIC CANNINGTON WA 6107 ee m VA A a e e N Vill 4 Sr GENIUS Open Mon Wed Fri 8 00am 5 30pm Thur 8 00am 8 00pm Sat 8 30am 5 00pm _Build It Yourself Electro aan HOME OF E SCIENTIST G Balcatta WA gome SIF fl tee A TROC ae Unit 7 58 Erindale Rd i Build It Yourself Electronics Centre T BALCATTA WA 6021 E Open Mon Fri 8 00am 5 30pm Sat 8 30am 5 00pm Sun 10 00am 4 00pm 16 Redback Proudly Made In Australia B LEDGARR LE RD ERINDA E o PARRAMATTA RD Sydney GPG MEGA MALL TST DUCK ST SHOR CENTRE RD Springvale a9 L gous al D ee www altronics com au
10. aring in mind the working area at ear level i e 1 2m sitting 1 6m standing However Loop Displacement typically between 10 and 25 of loop width up to 50 for small room can alter these figures for larger rooms especially for Perimeter loops Keep cabling 500mm to 600mm away from outside room border walls and preferably away from heavy traffic areas if placed under floor covering protection of cable In some construction styles the loop cable can actually be placed outside the room perimeter walls FINAL CHECKS Before an induction loop system is permanently installed it is recommended that Environmental electromagnetic noise should be checked with the venue s lights and all electrical systems turned on The loop wire should be temporarily taped or tacked in place and the system fully tested before performing final installation To check whether the loop system is interfering with audio visual systems the venue s audio amp video systems should be on when testing the loop If electric guitars are used they should be checked during the pre installation loop test in order to determine if their magnetic pickups are sensitive to the planned loop location Use of Dynamic Mics to be confined outside of Loop area Fig 4 0 illustrates the typical frequency repsonse required Response dB 31 5 Frequency Hz NOTE 1 The performance 1s normally checked at the frequencies where the tolerance are shown NOTE The reference 0
11. ated the Mic Line and AUX inputs will be overridden DIP Switches These DIP switches set the phantom power and Vox enable options Aux Input The AUX inputs are dual RCA connectors which are internally mixed to produce a mono input signal EWIS Input The EWIS inputs are dual RCA connectors which are internally mixed to produce a mono input signal www altronics com au 2 0 SETUP 2 1 SETUP GUIDE The A 4210 and A 4212 amplifiers have a total of four inputs A balanced 3 Pin female XLR Mic input a balanced 3 Pin female XLR Line input a dual RCA Aux input and a dual RCA EWIS input The Microphone input has an input sensitivity of 100mV while the Line Aux and EWIS inputs have an input sensitivity of 1V The Line input is suitable for connection from the Line Level output of another amplitier Phantom power 12V DC is available at the Mic input and VOX muting is available on the EWIS input only See DIP switch settings for more info on the phantom power and enabling the VOX muting For best performance when using long lines between microphones and the amplifier use balanced lines These reduce noise or hum that may be induced into the cables Note that a balanced line uses three wires two signal wires and one screened earth wire or shield where an unbalanced cable uses only one signal wire and a screened earth Fig 2 0 illustrates the input connections available LOOP RESISTANCE 0 20 TO 1 70 MAX 20 24V DC FUSE
12. cal Loops 3 7 Steps In Loop Design 3 8 Placement of Loops 4 0 Terms and Abbreviations 5 0 Specifications www altronics com au nHumBR A A lO O 0O N 10 10 10 11 12 13 13 14 Redback Proudly Made In Australia 3 Overview 1 0 OVERVIEW 1 1 INTRODUCTION Induction Loop amplifiers also known as T loop or Hearing Loop amplifiers are installed to greatly enhance the listening experience of people using hearing aids The hearing loop as its name suggests is basically a loop of wire which Surrounds a designated area to transmit audio to a hearing aid An audio source Is fed into the Amplifier and the output of the amplifier then sends a high current signal into the loop which generates a magnetic field The magnetic field Is then picked up by the Telecoil inside a hearing aid Hearing Loops are commonly installed in public areas which are generally noisy making it difficult for hearing impaired users to hear clearly The A 4210 and A 4212 amplitier models have been engineered to meet AS60118 4 2007 and in clude a compressor limiter circuit with tailored frequency response ensuring excellent speech intelligibility They will operate into loads of less than 2 ohms and are short circuit proof Great for places of worship community halls museums public places etc The A 4210 80VA model delivers 3 54 RMS 5 Amps peak and the A 4212 280VA model delivers 8A RMS 11 Amps peak into a typical Loop Resistance of 0 20 to 1 70
13. e Signal Presence Indicates when a signal is present at any of the Mic Line Aux or EWIS inputs VU Meter The dB output of the amplifier is indicated by the OdB to 15dB LED www altronics com au Redback Proudly Made In Australia 9 eto em Bi Lo a 3 0 LOOP DESIGN 3 1 LOOP DESIGN GUIDELINES Altronics does not guarantee absolute outcomes from following any specific information produced in these instructions This is purely a guide and assumes the Loop Design is made by someone with the appropriate qualifications or experience Note The most successful loops are designed with access to the site for measurements and proof of concept prior to completion of facility In the case of an existing venues access limitations may lead to compromise in final performance In brief Assisted listening Systems ALS include AM FM Transmitters Receivers Infrared Transmitters Receivers and Induction Loop Systems Most Hearing Aid Devices are available with the built in Telecoil T option No additional equipment is required for the pickup of the Electro Magnetic signal therefore making them a versatile device for detecting an electronic signal In Audio Frequency Induction Loops AFILs the signal is baseband audio and requires only a simple Telecoil pickup Hearing Aid fitted with T coil Listening area can be controlled by the loop layout and the system is not interrupted by physical obstacles On the down side the signal can be af
14. e copper foil or multi wire as long as the resistance is compatible with the amplifier requirements preferred load resistance range is 0 20 to 1 70 That includes feeder cable from amplifier location all terminations and the loop itself In the simplest installation the loop is terminated at the amplifier The fig 8 cables can be bulky under carpet utilising thinner underlay and other floor covering Foil and ribbon has a very low profile under carpet but are more prone to damage from excessive localised force or uneven flooring which moves with loading The table shown below provides examples of Altronics cables which would be suitable eFigure 8 cable Note Flexibility Resistance per cable length can be halved by paralleling or used as 2 Turn Cable Altronics Cat Description Max Current Resistance 100m No leg W4052 Heavy Duty 1 050 Larger loops teeder cable W4154 Very HD Feeder 0 450 HD Feeder cable only eMulti wire ribbon Altronics Cat No W2616 16 wires 283AWG 1 296mm2 3 7 STEPS IN LOOP DESIGN a suggested approach 1 Decide location and measure loop size length x width plus distance to Loop Drive Amplifier sa Check environmental background magnetic noise level A weighted using Field Strength meter FSM This will be a combination of 50Hz Hum associated with proximity of mains cabling or switchboards and 100Hz Buzz caused by rectification or light dimmers 5 Adjust location if required after noise level ch
15. ecks any identified thoroughfares through the space and other factors affecting the space 4 Calculate average current in single turn to give 100A m field strength from i a 9 5 Determine loop wire resistance R compatible with amplitier requirements 6 Determine amplifier drive characteristics to meet loop drive requirements 7 If possible install tape temporary loop into place on floor 8 Inject 1kHz tone into amplifier adjust gain control to correct operating level setting current for long term average Field Strength of 100mA m 9 Confirm Frequency Response of system tone 100Hz and 5kHz at 3dB unweighted 10 Verity signal quality with FS at 400mA m approximate Note correct signal should be a pulsed tone 11 For reference and repeatable calibrations manually plot long term FS readings in selected reference locations 12 Fit appropriate signage for system compliance under BCA www altronics com au Redback Proudly Made In Australia 13 ote om DIESO lA As a Starting point for typical Perimeter loops the long term average current is approximately the length of the shorter side divided by 9 and the max short term current is 12dB higher i e approx 4 times the length of shortest side divided by 9 3 8 PLACEMENT OF LOOPS Optimum position for loop is at floor level up to 250mm above or under floor depending on access to floor covering and floor structures or 2 4m to 3 5m above floor i e in suitable ceiling Be
16. fected by mains borne interference spill from adjacent loops and variations of frequency response due to metal loss or localised variations in magnetic field strength In Australia AFILs are the most commonly deployed hearing assistance mechanisms Loop locations Apart from public spaces as set down by the BCA loops can be utilized in lifts trains taxis domestic locations e g Living lounge rooms etc These specifications relate to the vertical component of the magnetic field The T coil in hearing aids is usually mounted vertically Not all hearing aids comply with this standard which often causes complaints about loop systems Exceptions must be made in certain situations where the head of the listener is not vertical places of worship hospitals and recovery areas as people may be kneel prone or supine 3 2 THE LOOP In its simplest form is a copper conductor fitted to the perimeter of area in interest Tig 8 cable is very satisfactory As the installation gets more demanding due to metal loss e g extensive use of reinforcement steel and requirements for tight control of spill the loop design becomes more complicated including use of multiple amplifiers For such applications requiring low spill high metal loss compensation designs it is recommended that a consulting engineer with appropriate experience be utilised The A 4210 12 amplifiers are not intended for use in multiple amplifier designs As for the loop resistance Altr
17. he presence of metal within the fabric structure of buildings has an impact on loop performance When any magnetic field generated by the audio loop in this case Eddy currents are generated as a result within any metal structures within the space The induced currents will lower the main magnetic field in localized spots areas causing degradation to the audio signal level or modifications to the tonal balance resulting in lack of clarity at especially at higher frequencies The type of metal and the profile has a bearing on amount of loss Examples of metallic structures include concrete floor reinforcement suspended ceilings metal counters and lifts By careful attention to design and detail the effects of metal can be minimised and sometimes completely eliminated Background Noise Measure the environmental background electromagnetic noise utilising a Field Strength Meter FSM with the loop system off The required figure is 32dB re 400mA m ideally preferred if 47dB Will accept 22dB as useable but report Hearing induction loop systems for large floor areas need to be carefully designed Simple perimeter loop layouts which work well tor small rooms with timber floors are often not suitable tor larger rooms For example loops installed in large rooms built upon concrete slabs can suffer field strength and frequency response losses due to the presence of structural steel reinforcement or reo laid within the slab In order to p
18. mps metre 0 125secs integration time Environmental Magnetic Background noise shall be no higher than 40dB A weighted measured with the loop system off Frequency Response of the system shall be from 100Hz to 5000HZz The variation should be no more than 3dB from the value taken at 1kHz The international standard is IEC 60118 4 also known as SN EN or BS 60118 4 www altronics com au Redback Proudly Made In Australia 11 Loop Design In practical terms the recommended field strength based on Australian Standard 60188 4 2007 100mAmps metre long term average gt 60 secs i e 12dB ref 400mA m rms 400mAmps metre 0 125secs becomes OdB ref and THD less than 1 Background noise 32dB A weighted ref 400mA m Please note that this standard is about the ability of the amplifier to deliver correct current into loop The aim of AFILs is to obtain Reasonable magnetic field strength within the working area at ear level 1 2 metre sitting 1 6 metre standing per AS60188 4 Minimal overspill which could cause interference with other similar systems or compromise confidentiality Acceptably uniform magnetic field strength over frequency range 100Hz to 5000Hz as per AS60188 4 Signal processing to achieve compression limiting so that the variation in output level is limited in Dynamic Range and to ensure that the amplifier never goes into clipping severe distortion thus creating unwanted EMC interference Metal T
19. onics A4210 and A4212 Hearing Loop Amplifiers preferred load resistance range is 0 20 to 1 7Q inherently short circuit proof and stability guaranteed to 20 See Loop Resistance and cable choice under Practical Loop section for more information 3 3 LOOP TYPES 1 Counter Loops Loops fitted to service information counters e g Post Office Doctors reception area Rail Ticket office etc Can be a simple matt style pre manufactured unit or more effectively a combination vertical horizontal coil fixture under the counter desk structure of the facility driven by a small amplifier and microphone combination Perimeter Loop Placing a loop typically at the edge or 600mm in of room boundary with a suitable feed termination from amplifier The loop wire resistance including feeder cable must meet requirements of amplifier specifications Some problems may arise regarding metal loss and loop spill into adjacent areas Never install the loop cable at head Hear Aid height as performance can be erratic due to field strength variation Spill can be as far as 3 5 times width of loop rolling off then decaying to complete zero Avoid installation of single Perimeter Loops in spaces larger than 10m x 10m as the field strength will potentially have large variations Plan for 2 or multiple loops 10 Redback Proudly Made In Australia www altronics com au Loop Design 3 2 Turn Perimeter Loop A variation of the Perimeter loop is a 2 turn cable
20. rovide an installed system which meets the applicable Australian Standards AS1428 and AS60118 4 2007 greater attention needs to be given to the site data loop design and implementation Finally adequate signage must be utilised for compliance 3 5 THEORETICAL LOOPS Definition of AMP METRE A field strength FS of 1 Amp metre 1A m exists at the centre of a circular loop of one metre diameter when a current of 1 Amp rms flows in the loop from H I 2R loop current R radius Square Loops For a square loop of one turn the field strength at the centre is given with a being the length of each side by H 22 m x i a Which means that a field strength of 100mA m would be given by a current i 0 1 x T x a 22 a 9 amps Naturally this calculation gives the field strength FS only at the centre of the loop but we need to know about the distribution of the field over the whole area of the loop Refer to the cross section of loop below and notice that at the centre the FS is lower than just inside the edge of loop wire on each side of perimeter 12 Redback Proudly Made In Australia www altronics com au Loop Design Field Strength in dE Fig 3 0 Cross section indicating Distribution of field strength Distance across loop in metres 3 6 PRACTICAL LOOPS Loop Resistance and Cable Choice as to be used with Altronics A4210 and A4212 amplifiers Loop Cable Types The loop cable can be figure 8 cabl
21. www altronics com au AUSTRALIAN MADE DEM D B 80VA Hearing Loop Amplifier 55 SS fa BS FA j Model A4210 X ry Vox 2 OUTPUT 3 tu inte Pi Phant Pi PHAS 24V DC FUSE 24V DC FUSE 75A VSL i 3 75A VSL 230V AC 50Hz Operating Manual A 4210 80VA Hearing Induction Loop Amplifier A 4212 280VA Hearing Induction Loop Amplitier SUITABLE FOR SIMPLE ONE AMPLIFIER DESIGNS NOT DESIGNED FOR COMPLEX MULTIPLE AMPLIFIER SYSTEMS NOT SUITABLE FOR INSTALLS WITH ADJACENT SYSTEMS Redback Proudly Made In Australia Distributed by Altronic Distributors Pty Ltd Phone 1300 780 999 Fax 1300 790 999 Internet www altronics com au IMPORTANT NOTE Please read these instructions carefully from front to back prior to installation They include important setup instructions Failure to follow these instructions may prevent the amplifier from working as designed User manual revision number 1 0 26 05 2015 AUSTRALIAN MADE Zo hebhie REDBACK is a registered trademark of Altronic Distributors Pty Ltd Since 1976 Redback amplifiers have been manufactured in Perth Western Australia by Altronics With over 35 years experience in the commercial audio industry we offer consultants installers and end users reliable products of high build quality with local product support We believe there is significant added value for customers when purchasing an Australian made Redback amplifier or PA product
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