Redback PHASE 5 A 4264 Operating Manual

OVERVIEW The Redback A 4264 is a 4 x 60 Watt power amplifier for installations requiring four amplifiers in a small rack space. The amplifier is ideally suited for use with multi zone audio systems using 100V line speaker systems only. FEATURES • 4 independent 60W amplifiers • Very Low noise and distortion • 100V outputs • 240V AC or 24V DC operation • Output Peak Limited • Thermal Overload protected • Power Status Indicators • Peak Limit Indicators • Overload Indicators • 2RU 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. 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 3 pin balanced XLR sockets with input sensitivities of 300mV. Pinout details are printed on the rear of the amplifier. The amplifier output level controls are rear mounted to prevent tampering or accidental adjustment. User manual revision number: 1.1 25/11/2015 A 4264 4 x 60Watt Power Amplifier DRAFT

2 Fig 1 A 4264 4 x 60 Watt Power Amplifier REAR PANEL CONNECTIONS 230V AC @ 50Hz FUSE 7.5 A M205 CH4 100V OUT INPUT 24V DC + – RISK OF ELECTRIC SHOCK OPEN BY QUALIFIED PERSONNEL ONLY ! CAUTION + _ 1 2 3 1 • Shield 2 • Hot 3 • Cold LINE IN CHANNEL 4 RESETTABLE DC FUSE Made in Australia by Altronic Distributors Pty Ltd www.altronics.com.au CHANNEL 3 RESETTABLE DC FUSE CHANNEL 2 RESETTABLE DC FUSE CHANNEL 1 RESETTABLE DC FUSE + _ CH3 100V OUT CH2 100V OUT + _ + _ CH1 100V OUT VOLUME CHANNEL 1 LINE IN VOLUME CHANNEL 2 LINE IN VOLUME CHANNEL 3 LINE IN VOLUME CHANNEL 4 1 2 3 1 • Shield 2 • Hot 3 • Cold 1 2 3 1 • Shield 2 • Hot 3 • Cold 1 2 3 1 • Shield 2 • Hot 3 • Cold 0 2 4 6 8 10 0 2 4 6 8 10 0 2 4 6 8 10 0 2 4 6 8 10 2 1 3 2 1 3 2 1 3 2 1 3 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 Fig 1 shows the layout of the A 4264 rear panel. 1 240V AC power socket (Australian standard) Connects to 240V AC mains power with the included IEC lead. 2 Channel 4 100V Out This is a 60W output for driving speakers fitted with 100V line transformers. 3 Channel 3 100V Out This is a 60W output for driving speakers fitted with 100V line transformers. 4 Channel 4 DC Fuse This is a resettable fuse for channel 4. If the fuse is tripped, press the red button to reset. 5 Channel 3 DC Fuse This is a resettable fuse for channel 3. If the fuse is tripped, press the red button to reset. 6 Channel 4 volume Use this to adjust the output level of channel 4. 7 Channel 4 input This is a balanced line input with a sensitivity of 300mV. 8 Channel 3 volume Use this to adjust the output level of channel 3. 9 Channel 3 input This is a balanced line input with a sensitivity of 300mV. 10 24V DC Battery Backup This is a 24V DC input used primarily for backup power. 11 Channel 2 volume Use this to adjust the output level of channel 2 12 Channel 2 input This is a balanced line input with a sensitivity of 300mV. 13 Channel 1 volume Use this to adjust the output level of channel 1. 14 Channel 1 input This is a balanced line input with a sensitivity of 300mV. 15 Channel 2 DC Fuse This is a resettable fuse for channel 2. If the fuse is tripped, press the red button to reset. 16 Channel 1 DC Fuse This is a resettable fuse for channel 1. If the fuse is tripped, press the red button to reset. 17 Channel 2 100V Out This is a 60W output for driving speakers fitted with 100V line transformers. 18 Channel 1 100V Out This is a 60W output for driving speakers fitted with 100V line transformers. DRAFT

3 DRAFT SPEAKER CONNECTIONS Speakers fitted with 100V line transformers 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 60 watts) 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 2 lists the impedance at certain loads of speakers fitted with 100V line transformers. So for a total load of 60 watts using 100V line transformer fitted speakers the impedance of the speaker load should be 166Ω. i Wiring speakers in parallel for 70/100V line: Where several speakers are to be used at one time, on one circuit, it becomes necessary to use speakers ftted with line-matching transformers. This is to overcome the effects of connecting speakers in parallel and cable losses. The amplifer generally has an output voltage of 100 volts (70 volts is typically used in North America, however operation is similar). In this confguration the total wattage load on the amplifer is derived from adding all the line transformer primary tap ratings together. For example, 70 one watt speakers will have a total speaker load of 70 watts. Or alternatively, it is conceivable to connect 100 one watt speakers to a 100 watt, 100 volt line amplifer. Measuring 70/100V Line Speaker Impedance: To measure amplifer system load, you must use an impedance meter in order to measure the ac resistance of the connected speaker network. Impedance cannot be measured with a standard multimeter, as this measures the dc resistance. Use the Altronics Q 2001 or similar impedance meter. About 70V & 100V Line Speaker Systems Load 70V 100V 0.5W 9.4kΩ 20kΩ 0.66W 7.12kΩ 15kΩ 1W 4.7kΩ 10kΩ 1.25W 3.76kΩ 8kΩ 2W 2.35kΩ 5kΩ 2.5W 1.88kΩ 4kΩ 3W 1.56kΩ 3.3kΩ 5W 940Ω 2kΩ 7.5W 626Ω 1.3kΩ 10W 470Ω 1kΩ 15W 313Ω 666Ω 20W 235Ω 500Ω 30W 156Ω 333Ω 40W 117Ω 250Ω 60W 78Ω 166Ω 100W 47Ω 100Ω 125W 37Ω 80Ω 250W 19Ω 40Ω 500W 9.4Ω 20Ω 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. 4-16Ω, 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 power LED’s 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 & 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 24V DC Out connector is wired correctly. Fig 2 A 4264 4 x 60 Watt Power Amplifier

4 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 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! 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 A 4264 4 x 60 Watt Power Amplifier *Specifications subject to change without notice SPECIFICATIONS Typical Specifications per channel Power Output: ............................60 watts RMS Distortion: ...............................< 0.5%, @ 1kHz Output line: ...............................................100V Frequency Response: ............50Hz - 15kHz, -3dB Sensitivity: ..............................................300mV Signal to Noise Ratio: ..............................>90dB OUTPUT CONNECTORS Speakers: ....................................Screw terminals INPUT CONNECTORS Inputs: .....................................3 pin XLR balanced 24V DC power: .............................Screw terminals 240V AC power: ...................IEC power connector CONTROLS Line inputs:......................................................Volume Power: ...................................................On/off switch Indicators:...........................Power, Peak Limit,overload Power Supply: ..............................240V AC or 24V DC FUSE PROTECTION: ..........................7.5A AC , 5A DC DIMENSIONS .............................≈483W x 410D x 88H WEIGHT: ............................................................≈15kg Colour:.................................................................Black DRAFT