Operating Manual
Contents
1. 230V AC 50Hz Fuse 10A M205 LINKTO CHARGE 1A Max BACKUP RESETTABLE RESETTABLE BATTERY FUSE 20 AMP FUSE 20 AMP OUTPUTS LINK THESE TERMINALS TO CHARGE BACKUP BATTERY DIP Switch settings The A 4395 amplifier has a set of options which are enabled via the DIP switches 1 4 See Fig 6 DIP 1 sets the input level sensitivity for input 1 either the balanced 3 pin XLR or Dual RCA s DIP 2 enables the VOX muting When the VOX is active input 1 will mute input 2 DIP 3 enables the phantom power to the XLR connector on input 1 DIP 4 sets the input level sensitivity for input 2 1 Input 1 Sensitivity i 2 vOxEnabie On OF 3 Phantom Power mic On Of Fig 6 www altronics com au Redback Proudly Made In Australia 7 A 4395 500 Watt Power Amplifier TROUBLE SHOOTING If the REDBACK Phase 4 amplifier fails to deliver the rated performance check the following No Power No Lights Make sure amplifier power switch is on Make sure mains power switch is on at the wall Check the mains and DC fuse Replace with only the correct type and rating Over rated fuses will invalidate warranty Distorted Output Check that the speaker type is correct for the output that you are using ie 4 160 70V or 100V line Check for any short circuits on the speaker line Very Low Output Volume Make sure that the input is the correct level check for shorted connectors Check for any short circuits on the speake2. 60W 780 1660 load you must use an impedance meter in order to measure the ac resistance 100W 470 4000 of the connected speaker network Impedance cannot be measured with a 425W 370 800 standard multimeter as this measures the dc resistance Use the Altronics 250W 190 400 Q 2001 or similar impedance meter 500W 9 40 200 AUDIO CONNECTIONS The amplifier has two audio inputs with input 1 either a balanced XLR input or dual RCA line input which is internally mixed to create a mono signal Input 2 is a dual RCA which is internally mixed to create a mono signal Both inputs have adjustable input sensitivities of 100mV or 1V set by the DIP switches on the rear of the unit A music input on the front of the amplifier is also provided for connection of portable devices This input when connected over rides the rear input 2 audio source and is adjusted via the volume 2 level control A VOX function is also included which when enabled will allow input 1 to mute input 2 Fig 4 shows a typical install where the A 4395 has a balanced microphone connected to input 1 and a Line level source connected to input 2 If DIP switch 2 is set to ON the microphone will VOX mute the CD player connected to input 2 Speakers fitted with 100V line transformers CAUTION RISK OF ELECTRIC SHOCK Input 1 OPEN BY QUALIFIED PERSONNEL ONLY Input 1 Sensitivity VOX Enable Phantom Power Mic Input 2 Sensitivity 230V AC 50
3. Hz Fuse 10A M205 LINKTO INPUT 24V DC OUTPUTS Made in Australia by Altronic Distributors Pty Ltd www altronics com au o e oo M i Balanced Mic Wiring RESETTABLE RESETTABLE FUSE20AMP FUSE 20 AMP artia REDBACK Fig 4 6 Redback Proudly Made In Australia www altronics com au A 4395 500 Watt Power Amplifier POWER SUPPLY The amplifier operates on 230V AC or 24V DC primarily for battery backup operation Ensure power is switched OFF at the front panel before connecting either mains power to the IEC socket or 24V DC to the screw terminal input As high currents may be drawn when operating from a 24V DC supply confirm the capacity of the DC power supply used 24V DC OUTPUT A constant 24V output terminal has been provided to power ancilliary 24V devices The output has a maximum current draw of 1 amp If more than 1 amp is drawn from the output internal polyswitches will disconnect the output These will reset once the current draw is reduced 24V BACKUP BATTERY CHARGING The A 4395 amplifier includes a charging circuit so that a backup battery connected to the amplifiers 24V DC Input can be trickle charged The battery charger is connected to the battery internally when the link is fitted to the charging link connector see Fig 5 for more details The battery will be charged at approximately 300mA Speakers fitted with 100V line transformers A 4395 AMPLIFIER
4. 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 2015 Altronic Distributors 2 Redback Proudly Made In Australia www altronics com au OVERVIEW The Redback A 4395 is a 500 Watt Mixer amplifier for installations requiring a high power zone amplifier Ideally suited for use in shopping centres pedestrian precincts public transport facilities and convention centres The amplifier has two audio inputs with input 1 either a balanced XLR input or dual RCA line input and input 2 a dual RCA There is also a music input on the front of the amplifier for connection of portable devices This input when connected over rides the rear input 2 audio source and is adjusted via the volume 2 level control A VOX circuit with front panel sensitivity adjustment
5. allows input 1 to mute input 2 Phantom power 15 volts is available at the 3 pin XLR on input 1 and both inputs 1 and 2 have adjustable input sensitivies The amplifier has a host of protection circuitry including over current over voltage and short circuit protection FEATURES e Robust design incorporating latest Mosfet technology e Very Low noise and distortion e 70V 100V and 4 160 outputs e 240V AC or 24V DC operation e 24V DC 1 Amp output for external devices e 300mA battery trickle charge e Adjustable input level sensitivities e Bass and Treble controls e Phantom power on microphone input XLR Input 1 e Multi stage thermally cued fan cooling e Output Peak Limited e Thermal Overload protected e Signal Presence Indicators e Fault Indicators e Power Status Indicators e Rack Mountable suits 19 inch racks www altronics com au Redback Proudly Made In Australia 3 Fig 1 shows the layout of the front panel 10 11 12 13 14 15 500W Public Address Mixer Model A 4395 Volume 1 Volume 2 Treble Bass vox _ Sema Music Signal Status Fault Status Power Status Sens OO 5 o ojo o o 10 Present Peak VOX Over Current Shut 24VDC Mains On Limit Active Temp Limit Down 6 7 8 9 1011 12 13 14 Fig 1 Bass and Treble Controls Use these controls to adjust the bass and treble Vox lev
6. ed at approximately 300mA 5 24VDC IN Battery Backup Provision has been provided to run the amplifier from a suitably rated 24V battery system in the event of a mains failure Using appropriately rated cable connect the battery to the 24V DC In terminals Observe correct polarity when connecting see Fig 5 for more details 6 Input 1 This input can be either a balanced XLR input or dual RCA line input with adjustable input sensitivities of 100mV or 1V The line input dual RCA connectors are internally mixed to produce a mono input signal 7 Input 2 This input is a dual RCA line input with adjustable input sensitivities of 100mV or 1V The line input dual RCA connector is internally mixed to produce a mono input signal 8 DIP Switches These DIP switches set the input sensitivities of inputs 1 amp 2 enable the VOX muting and enable the phantom power to the XLR input see Fig 6 for more detail www altronics com au Redback Proudly Made In Australia 5 A 4395 500 Watt Power Amplifier SPEAKER CONNECTIONS Speakers with a total impedance or 4 160 may be connected to the terminals marked 4 160 on the rear of the amplifier Speakers fitted with line transformers either 70V or 100V may be connected to the corresponding terminals on the rear of the amplifer Always ensure the total load of the fitted speakers does not exceed the rated output of the amplifier ie 500 watts otherwise damage may result When fitting speakers with li
7. el control Use this control to adjust the vox sensitivity of input 1 Input 1 volume control Use this control to adjust the output volume of input 1 Music Input Use this input to connect a portable music player This input over rides the rear input 2 and is adjusted via the volume 2 pot Input 2 volume control Use this control to adjust the output volume of input 2 Signal Presence Indicator This LED indicates when an input signal is present Peak Limit Indicator This LED indicates when the input signal is clipping VOX Active Indicator This led indicates when the VOX muting is active Over Temp Indicator This LED indicates when the amplifier is overheating The output will be disconnected until the amplifier is once again cool enough to operate Current Limit Indicator This LED indicates when the output is drawing too much current from the amplifier The output will be disconnected until the current draw is reduced Shut Down Indicator This LED indicates when the amplifier has an over temp occurrence or if the internal circuitry has a fault 24V DC Indicator This LED indicates when the amplifier is being powered from the 24V input Mains Indicator This LED indicates when the amplifier is being powered from the mains 230V AC On Indicator This LED indicates the unit has power Power Switch Use this to turn the unit on 4 Redback Proudly Made In Australia www altronics com au Fig 2 shows the layou
8. ne transformers the impedance of the load cannot be measured using a standard multimeter An impedance meter is required Fig 3 lists the impedance at certain loads of speakers fitted with 70V and 100V line transformers So for a total load of 500 watts using 100V line transformer fitted speakers the impedance of the speaker load should be 200 D About 70V amp 100V Line Speaker Systems Load c 7 oa ioo Wiring speakers in parallel for 70 100V line Where several speakers are to O 66W 712kQ 15KO be used at one time on one circuit it becomes necessary to use speakers fitted 1W 4 7kO 10kQ with line matching transformers This is to overcome the effects of connecting 1 25W 3 76kQ 8kO speakers in parallel and cable losses The amplifier generally has an output aw 235K 5k 2 5W 1 88k0 4KO 3W 1 56k0 3 3kQ 5W 9400 2k0 voltage of 100 volts 70 volts is typically used in North America however operation is similar In this configuration the total wattage load on the amplifier is derived from adding all the line transformer primary tap ratings together For 75W 6260 1 3k0 Fi g 3 example 70 one watt speakers will have a total speaker load of 70 watts Or 10W 4700 1kO alternatively it is conceivable to connect 100 one watt speakers to a 100 watt 15W 3130 6660 100 volt line amplifier 20W 2350 5000 30W 1560 3330 Measuring 70 100V Line Speaker Impedance To measure amplifier system pou lige 2500
9. r line Check if signal LED on the front panel is lit to indicate there is signal If it is not lit there is no signal present Continually Blows Fuses Make sure that the speaker line is not shorted Check speaker types ratings and if on correct output Amplifier Keeps on Cutting In amp Out Make sure that there is adequate ventilation around the amplifier Check the vent slots on the front top and sides are not covered or blocked and the fan on the rear is functioning correctly Check also speaker types ratings and for any short circuits on the speaker line Backup Battery Not Charging Make sure the link is fitted to the charging link connector No Output From 24V DC Make sure the 24V DC Out connector is wired correctly SPECIFICATIONS POWER OUTPUTS INPUT CONNECTORS AFB OSE E EA 500 watts RMS Inputs 3 pin XLR balanced or 2 x RCA Distort Mii inziens lt 0 5 1kHz 24V DC power aiaee Screw terminals Output line oo 70V 100V or 4 160 240V AC power IEC power connector CONTROLS FREQUENCY RESPONSE MIGCIM PUTS aon Volume Mic INpUt sisusse 50Hz 12kHz 3dB Line INPUTS eee ec ceeeeeeeeeteeeeeees Volume Line inputs assisia 50Hz 15kHz 3dB BASS E A N E cece 10dB 100Hz Treble 10dB 10kHz SENSITIVITY POWER drenan On off switch Mic INPUTS vo eee eeeeettteeeeeetees 100mV or 1V Indicators 0 Power signal present output peak LING INPUTS aetna nR 100mvV or 1V limiting overtemp cur
10. rent limit shutdown VOX active SIGNAL TO NOISE RATIO Mic inputs gt 75dB below rated output Line inputs gt 81dB below rated output OUTPUT CONNECTORS Speakers cceeeeeeeeeeee Screw terminals 24V DC Mains Power Supply 5 240V AC or 24V DC FUSE PROTECTION A4395 osapaine 10A AC 20A DC DIMENSIONS E nad aan agivowsubed beeneesanite 483W x 410D x 88H Specifications subject to change without notice 8 Redback Proudly Made In Australia www altronics com au
11. t of the rear panel A put 2 Sensitivity LINKTO RGE 230V AC 50Hz Fuse 10A M205 A Made in Australia by Altronic Distributors Pty Ltd www altronics com au O amp i RESETTABLE RESETTABLE FUSE 20 AMP FUSE 20 AMP Shiel gt 5 Ca C ie Balancer 1234 Col lic Wirin oa DIP Switches OUTPUTS BEER Fig 2 1 Output Connections Speakers with total impedance of 4 to 16 ohms or speakers fitted with a 70V 100V line transformer may be connected Always ensure that the total load of the speakers does not exceed the rated output of the amplifier ie either 40 minimum for the 4 160 terminals or 200 minimum at 100V for 500W Otherwise either the DC or mains fuse could blow or the fault led activate and the amp will shut down Always be careful to avoid short circuits and connection to the wrong terminals 2 24V 1A output A constant 24V output terminal has been provided to power ancilliary 24V devices 3 DC Resettable fuses These fuses protect the internal power supply If the fuses are tripped they are easily reset by pressing the small buttons on the fuses 4 24V Backup battery charging The A 4395 amplifier includes a charging circuit so that a backup battery connected to the amplifiers 24V DC Input can be trickle charged The battery charger is connected to the battery internally when the link is fitted to this connector see Fig 5 for more details The battery will be charg
12. www altronics com au AUSTRALIAN MADE PEAH 500W Public Address Mixer Model A 4395 Power Status 24VDC Mains On ABLE FUSE20AMP FUSE 20 AMP EJ Operating Manual A 4395 500 Watt Mixer Amplifier 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 1 10 09 2015 uStralian Ma Since 1976 a gt gt zr P 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 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
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