Bogen BPA60 audio amplifier
Contents
1. OND COM CT a6 160 POV COAL Figure 1 RPA 60 Rear Panel Connection Diagram OUTPUT CONNECTIONS CAUTION Follow local electrical codes when connecting amplifier output Figure 1 shows the location and impedance values for the output terminal strip Class 2 wiring is acceptable for output loads SPEAKERS The amplifier may be used with most conventional speaker systems Connect speaker systems directly to the output terminal strip on the rear panel Connect one speaker lead to the COM terminal and the other to the terminal corresponding to the impedance of the speaker system If the load impedance falls between two output ter minal values use the terminal of jower impedance Total power distribution to the speakers should not be greater than the power rating of the amplifier For balanced output lines remove the link between the COM and GND terminals If the line is shielded connect the shield to the GND terminal For unbalanced speaker lines close the link between the COM and GND terminals HUM If the connections between the signal sources and amplifier are incorrect or defective hum type interference may occur Check for proper grounding broken wires or shields poor connector con TRANSFORMER SOCKET XT1 Figure 2 BPA 60 Printed Circuit Board tacts etc Keep input cables away from speaker cables and speaker cables away from AC power lines Where a turntable or other aux iliary equipment is used it may b2. heat with inade quate ventilation The thermal breaker will open when the temper ature at the output transistor heat sink reaches 105 C CIRCUIT BREAKER If the AC circuit breaker opens the power switch lamp will go out and the amplifier will have no dutput however there will be power at the AUX POWER receptacle on the rear panel Set the POWER switch to OFF and momentarily depress the red button on the circuit breaker to reset it Return the POWER switch to ON If the circuit breaker trips again do not attempt to reset it have the trouble investigated by a qualified technician MAINTENANCE CAUTION There are no user serviceable parts within the ampli fier Have all internal servicing performed by a qualified technician The warranty will become void if repairs are made by other than the Bogen Service Department or authorized service agency BOGEN SERVICE We are interested in the maintenance of your Bogen equipment In the event of any difficulty do not hesitate to ask our advice or assistance Information may be obtained by writing to Service Department Bogen Communications Inc P O Box 575 Ramsey NJ 07446 When communicating with us give the model and series designa tion of your unit Describe the difficulty and include details on the electrical connections to associated equipment such as preamplifiers speakers etc We will send you service information if the trouble appears simple If the amplifier requires servic
3. BOGEN COMMUNICATIONS INC BASIC POWER AMPLIFIER TECHNICAL SPECIFICATIONS Rated Output Power 60 watts rms see curves Total Harmonic Distortion Less than 2 from 50Hz to 15kHz Frequency Response 2dB 20Hz to 20kHz Input Sensitivity High impedance 300mV low impedance balanced with optional transformer 75mV Hum and Noise 85dB below rated output Output Leads 8 ohms 25V 16 ohms 25VCT 70V Output Regulation Better than 2dB from no load to full load Input Impedances High impedance 50k ohms unbalanced low impedance 600 ohms balanced or unbalanced 1 1 bridging with accessory transformers Lo Cut Filter 10dB at 100Hz switch selectable Controls and Indicators Front Panel Iluminated on off power switch Rear Panel Input level control circuit breaker reset lo cut switch This receptacle will be grounded only if the amplifier is properly grounded All specifications are subject to change without notice Power Consumption 120VAC 60Hz 180W at full rated output Overload Protection Transient protection diodes electrical cir cuit breaker 105 C thermostat Operating Temperature Range 20 to 55 C at rated output Auxiliary Receptacle not switched Three wire grounded 300W maximum Dimensions 15 1 4 W x 8 D x 3 1 2 H 38 7 x 20 3 x 8 9cm Finish Black Weight 19 lbs 8 6 kg Accessories Model TL600 600 ohm line matching transformer Model TL100 1 1 ratio transformer R
4. ack Panel Brackets Bogen Model RPK 53 Before Operating This Unit Please Read These Instructions Carefully Printed in USA 54 5810 05 9907 DESCRIPTION The Bogen Model BPA 60 amplifier has been designed to fulfill the basic power amplification requirements of professional and com mercial sound systems The BPA 60 supplies 60 watts rms output Total harmonic distortion is less than 2 at rated output from 50 to 15 000Hz with a frequency response of 2dB from 20 to 20 000Hz as illustrated in the performance characteristics graphs An input signal of only 300miV is required for full rated output 75niV for low impedance balanced input with accessory transformer TL600 Input impedances are high impedance 50 kilohms unbalanced low impedance 600 ohms balanced with accessory transformer TL600 Output impedances are 8 ohms 25V 16 ohms 25VCT and 70V An amplifier that provides a 25 volt ur 70 volt constant voitage output may be used to drive the BPA 60 amplifier Line bridging may be achieved using accessory transformer TL100 A lo cut filter provides 10dB attenuation at 100Hz Ani sy deo level control screwdriver adjustable allows higher inputs without overdrive An AC circuit breaker and transient protection diodes prevent damage due to overloads The amplifier is also thermally protected from excessive temperatures however it will deliver the full rated power output continuously even at 55 C 130 F An illuminated powe
5. e necessary to connect a separate ground wire from the chassis of such equipment to a suitable earth ground OPERATION POWER The POWER switch applies power to the amplifier it does not control any associated equipment which may be connected to the auxiliary power receptacle on the rear panel The switch lamp will illuminate when power has been applied to the unit LO CUT FILTER SWITCH The LO CUT filter switch located on the rear panel provides 10dB attenuation at 100Hz INPUT LEVEL CONTROL The INPUT LEVEL control screwdriver adjustable located on the rear panel is uscd to ad just the input signal applied to the amp Turn the control clockwise to increase the level CAUTION Many loudspeakers may be damaged if overdriven Therefore always begin system setup with the INPUT LEVEL control fully counterclockwise and gradually increase the Setting to obtain the desired output level TO HIGH OUTPUT IMPEDANCE TERMINAL PUT OF STRIP OF R ry POWER AMPLIFIER 74 O738 A AT 7OV RI IOK I 2W AT 25V Rie 3 3K 1 2W Figure 3 Input From Another Amplifier THERMAL BREAKER If the thermal breaker opens there will be no audio output however the power switch lamp will remain iliu minated Wait approximately two minutes for the breaker to reset If it resets and then opens again investigate the cause of the temperature overload This may be due to improper connections at the output terminais or to excessive environmental
6. ing we will send you the name and address of the nearest authorized Bogen service agency Wher shipping the amplifier pack it well using the original ship ping carton or similar container and filler material to prevent damage in transit Remove any plug in transformer from the printed circuit board before shipping Send the unit fully insured and freight prepaid via UPS or other responsible carrier It will be returned to you col lect or freight prepaid while in warranty REPLACING COMPONENTS All semiconductor components on the printed circuit board are soldered in place to ensure maximum reliability When soldering or unsoldering transistors and diodes use a heat sink such as a small alligator clip between the source of heat and the component When replacing driver and output transistors be certain to install the case heat sink insulator after lightly coating both sid s with a ther mal conducting compound such as Dow Coring No 340 or equivaient BOGEN COMMUNICATIONS ING 50 SPRING STREET P O Box 575 RAMSEY NJ 07446 201 934 8500
7. ns requiring the removal of the cover of the amplifier unless you are qualified to do so LOW IMPEDANCE BALANCED INPUT A balanced input provided at the BAL LO Z terminal strip Figure 1 requires the installation of a Bogen Model TL600 line matching transformer Remove the top cover of the unit and install the transformer in the socket designated XT 1 see Figure 2 on the printed circuit board If an unbalanced input is required connect a jumper from the GND terminal to an adjacent input terminal HIGH IMPEDANCE INPUT A high impedance input is provided by standard RCA jacks see Figure 1 An input signal of 300mV is required for full rated output BRIDGING INPUT The inputs of two or more amplifiers may be paralleled by installing accessory transformer TL100 for up to 6 amplifiers in the transformer socket designated XT 1 see Figure 2 on the printed circuit board Connect the signal source to the BAL LO Z terminal strip and connect the cable shield to the GND terminal For an unbalanced input connect a jumper wire from the GND terminal to an adjacent input terminal INPUT FROM ANOTHER AMPLIFIER The BPA 60 may be driven from an amplifier that provides a 25 volt or 70 volt constant voltage output Connect the output of the driver amplifier to one of the HI Z input jacks via a resistor network see Figure 3 These resistors are in addition to the normal loudspeaker load impedance on the output of the driver amplifier 28v ens
8. r switch is located on the front panel Input and output connectors input level control lo cut filter switch AC circuit breaker and auxiliary power receptacle are located on the rear panel The thermal breaker and accessory transformer socket are located internally The amplifier operates from a 120 volt 60Hz source The three wire line cord provides automatic grounding of the amplifier and auxiliary receptacle when connected to a properly grounded three wire power outlet INSTALLATION UNPACKING The amplifier was carefully checked before leaving the factory Inspect the shipping container carefully for indications of damage If the amplifier has been damaged place an immediate claim with the distributor from whom it was purchased If the unit was shipped to you notify the carrier without delay and place a claim RACK MOUNTED INSTALLATION The amplifier may be mounted in a standard 19 inch equipment rack by using the Bogen Model RPK 53 Rack Panel Kit which in cludes two brackets and the necessary hardware for installation NOTE Before installing the amplifier in a rack install any accessory transformers required See INPUT CONNECTIONS RPK S53 Attach a bracket to each side of the unit and secure with screws provided through the holes on the side panel Each bracket measures 3 1 2 H x 1 15 16 W x 1 D 8 9 x 4 9 x 2 5 cm VENTILATION The amplifier generates heat during operation Although the amount of heat is rela
9. tively low the amplifier must be ventilated to prevent excessive rise in temperature If other heat producing equip ment or several amplifiers have been installed in an enclosed rack or Cabinet ensure that the ambient air temperature does not exceed 55 C 130 F To determine this operate the system until the temperature stabilizes then measure the air temperature near the amplifier using a bulb type thermometer If the temperature exceeds 55 C space the equipment farther apart or install a fan POWER AND GROUNDING The three wire AC line cord has a three prong plug which should be plugged into a properly grounded three wire 120V 60Hz outlet IT IS IMPORTANT TO GROUND THE AMPLIFIER If the outlet is not properly grounded connect a wire from the GND terminal of the amplifier to a suitable carth ground AUXILIARY POWER CAUTION The front panel POWER switch does not control the aux iliary receptacle The AUX POWER receptacle on the rear panel is a three wire grounded outlet and may be used to supply power to accessory equip ment in the sound system Ensure that the accessory equipment does not require more than 300 watts Equipment connected to the auxiliary receptacle will be grounded provided the amplifier line cord has been properly grounded INPUT CONNECTIONS WARNING The following installation instructions are for use by qualified service personnel only To avoid an electric shock hazard do not perform any functio
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