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1. 1kHz Frequency response 50Hz 15kHz 3dB Output line 100V 70V or 4 16Q Signal to noise ratio peak limiting by passed gt 90 dB Line output 60002 balanced OdBV 3 pin XLR Speaker connection Screw terminals 24V DC output Screw terminals Inputs 3 pin XLR 500mV 24V 30V dc power Screw terminals 240V ac power IEC power connector Indicators Mains 24V dc Power Signal presence Over temp Over current Shut down Peak limiting Current Draw A 4370 250mA Standby 8A Full 24V dc Current Draw A 4380 250mA Standby 17A Full 24V dc Power supply 240V ac or 24V dc nominal Protection A 4370 5A ac and 10A dc fuse A 4380 7 5A ac and 20A dc fuse Dimensions 483W x 340D x 88H Specifications subject to change without notice 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 manu facturing of commercial audio equipment in the mid 70 s we have always taken p
2. by Altronic 8 Phantom Power Input 1 On Off 2 Not Used 2 NotUSed i Distributors Sets the Preamplifier output to 3 Not Used 3 Input3 Priority On Off 1 Pty Ltd Pre or Post Master 4 Not Used 4 Input 3 Level 100mV Speakers fitted with 100V line transformers MODEL AC FUSE A 4370 5A A4380 7 5A OUTPUTS 24V DC 70V 4 160 Made in Australia by sie 1 He Altronic Distributors Pty Ltd www altronics com au 5378 CAUTION OPEN BY QUALIFIED PERSONNEL ONLY RISK OF ELECTRIC SHOCK macem AA CAGA RESETTABLE FUSE AC FUSE 5A 7 5A OUTPUTS AUSTRALIAN MADE Made in Australia by Altronic Distributors Pty Ltd www altronics com au aa Boers 230V AC 50Hz lt EJ E E Bp OPEN BY QUALIFIED PERSONNEL ONLY z o z Of ES 5 lt fy U RESETTABLE FUSE N gt lt mi gt lt U a mi JJ I AC FUSE 5A 7 5A OUTPUTS AUSTRALIAN MADE Made in Australia by Altronic Distributors Pty Ltd wwwaaltronics com au 5378 CAUTION RISK OF ELECTRIC SHOCK OPEN BY QUALIFIED PERSONNEL ONLY 330v AC Soke el Tea a C E RESETTABLE FUSE Fig 2 www altronics com au Redback Proudly Made In Australia 3 SPECIFICATIONS Measurements referenced to 1kHz Power output A 4370 125 W RMS A 4380 250W RMS Distortion lt 0 5
3. cuit it becomes necessary to use speakers fitted 1W 4 7KQ 10kQ with line matching transformers This is to overcome the effects of connecting 1 25W 3 76kQ 8kQ speakers in parallel and cable losses The amplifier generally has an output 2W 2 35kKQ 5KO voltage of 100 volts 70 volts is typically used in North America however ae hae sae operation is similar In this configuration the total wattage load on the amplifier BW 9400 KQ is derived from adding all the line transformer primary tap ratings together For 75W 6260 1 3KQ Fi g 1 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 y D load you must use an impedance meter in order to measure the ac resistance 100W 470 1000 of the connected speaker network Impedance cannot be measured with a 125W 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 24V DC OUTPUT A constant 24V output terminal has been provided to power ancilliary 24V devices see Fig 2 for more details The ouput has a maximum current draw of 1 amp If more than 1 amp is drawn trom the output internal polyswitches will disconnect the output These will reset once the current draw i
4. ifier passed through each slave amplifier MIXER AMPLIFIER Rem PTT AUSTRALIAN MADE ees short to Switched e activate faib Output aia D 100V 5 a ry a T z TE te E RES S Ba 230V AC 50Hz RESETTABLE LinkTo 2 DC FUSE 24V DC IN Backup batter 2K Priority or VOX muting is only DIP5 DIP3 DIP 1 Input j Input 1 functional on inputs 1 3 When VOX is enabled on input 1 it will M item Oni Orr iter Oe item a PERSONNEL ONLY override all other inputs includ 1 switched 24vocout On Off a Input 6 Level 100mV Input 2 Level Balanced Mic Balanced Mic ing the Alert Evac Module vox 2 Preamp Out T Pre Post _2 NotUSed 2 Input 2 Priority ze On gt enabled on input 2 will override 3 phantom Powerinpute On off _3 Not USed 3 _ Input 1 Priority On of Le inputs 3 6 VOX enabled on input 4 Input 5 Level iv__ 100mv 4 Input 1 Level 1V_ 100mv 3 will override inputs 4 6 4 Phantom Power Input 5 On Off g AC Fuse Ratings If the Alert Evac module is fitted 5 Phantom Power Input 4 On Off DIP 4 DIP 2 3 125W 250w Etuillovertide inputs 26 6 Phantom Powerinput3 On Off Ey ER E onal BOT AC Fuse Made in Australia 7 Phantom Powerinput2 On Off 1 Not Used 1 Input 4 Level 1V o
5. ride 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 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 Distributed by Altronic Distributors Pty Ltd Phone 1300 780 999 Fax 1300 790 999 Internet www altronics com au 4 Redback Proudly Made In Australia www altronics com au
6. s reduced 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 with 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 speaker 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 No Output From 24V DC Make sure the 2 Redback Proudly Made In Australia www altronics com au Fig 2 shows a typical install where the A 4370 amplifiers are used as slave amplifiers with the audio output from the mixer ampl
7. www altronics com au AUSTRALIAN MADE a Fa a7 250W Public Address Amplifier E el A 4380 240V AC 50Hz Made in Australia by Altronic Distributors Pty Ltd www altronics com au Operating Manual A 4370 125 Watt Power Amplifier A 4380 250 Watt Power Amplifier OVERVIEW These Redback 125W and 250W power amplifiers are ideal for installations requiring high power zone amplifiers Ideally suited for use In shopping centres pedestrian precincts public transport facilities and convention centres 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 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 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 see Fig 2 for more details As high currents may be drawn when operating from a 24V DC supply confirm the capacity of the DC power supply used AUDIO CONNECTIONS Audio input is via a 3 pin XLR socket on the rear of the amplifier This is a 500mV line level balanced signal which is normall
8. y fed from from a mixer panel Pinout details are printed on the rear of the amplifier A balanced Line Out XLR socket is also provided on the rear of the amplifer for passing the audio signal on to more slave amplifiers if required The amplifier output level control is also rear mounted to prevent tampering or accidental adjustment see Fig 2 for more details Redback Proudly Made In Australia User manual revision number 1 0 30 10 2014 SPEAKER CONNECTIONS Speakers with a total impedance or 4 160 may be connected to the terminals marked 4 16Q 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 ampliter Always ensure the total load of the fitted speakers does not exceed the rated output of the amplifier otherwise damage may result When fitting speakers with line transformers the impedance of the load cannot be measured using a standard multimeter An impedance meter is required Fig 1 lists the impedance at certain loads of speakers fitted with 70V and 100V line transformers So for a total load of 250 watts using 100V line transformer fitted speakers the impedance of the speaker load should be 400 About 70V amp 100V Line Speaker Systems Fe epee Wiring speakers in parallel for 70 100V line Where several speakers are to 0 66W 7 12kQ 15k be used at one time on one cir

Operating Manual

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