Bogen HTA125A audio amplifier
Contents
1. Low Impedance Balanced Input Caution To avoid electric shock be sure to disconnect AC Power Cord before removing the cover of the amplifier unit DO NOT perform any function requiring the removal of the cover of the amplifier unless you are qualified to do so A balanced input provided at the BAL LO Z terminal strip requires the installation of a TL600 line matching trans former Remove the top cover of the unit and install the transformer in the socket designated T1 provided on the printed circuit board An input signal of 150mV is required for full rated output Bridging Input Caution To avoid electric shock be sure to disconnect AC Power Cord before removing the cover of the amplifier unit DO NOT perform any function requiring the removal of the cover of the amplifier unless you are qualified to do so The inputs of two or more amplifiers may be paralleled with out loss of gain To do this install a TL100 transformer for up to 6 amplifiers in the transformer socket designated T1 on the printed circuit board Connect the signal source to the BAL LO Z terminal strip on the rear panel Use the two outside terminals on the input terminal strip and connect the cable shield to the GND terminal If an unbalanced input is required connect a jumper wire from the GND terminal to an adjacent input terminal Caution Follow local electrical codes when connecting amplifier output Output connections are available on the rear pane2. HTA125A 250A Power Amplifiers Installation amp Use Manual Specifications subject to change e witho ut notice 2010 ny sate Communica tions ie All rights r ved 54 5832 04B 1011 NOTICE Every effort was made to ensure that the information in this guide was complete and accurate at the time of printing However information is subject to change WARNING To reduce the risk of Fire or Electric Shock Do Not Expose this apparatus to rain or moisture Apparatus shall not be exposed to dripping or splashing and no objects filled with liquids such as vases shall be placed on the apparatus WARNING Only connect unit to AC mains outlet providing protective earthing connection NOTE Mains plug is used as disconnect device from the mains and shall remain readily accessible and operable CAUTION These servicing instructions are for use by qualified service personnel only To reduce the risk of electric shock do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so CAUTION DO NOT INSTALL OR PLACE THIS UNIT IN A BOOKCASE BUILT IN CABINET OR IN ANOTHER CONFINED SPACE ENSURE THE UNIT IS WELL VENTILATED TO PREVENT THE RISK OF SHOCK OR FIRE HAZARD DUE TO OVERHEATING ENSURE THAT CURTAINS AND ANY OTHER MATERIALS DO NOT OBSTRUCT THE VENTILATION VENTS Always follow these basic safety precautions when installing and using the unit IMPORTANT SAFETY INSTRUCTIONS Read th
3. or limita tion of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from State to State Products that are out of warranty will also be repaired by the Bogen Factory Service Department same address as above or call 201 934 8500 The parts and labor involved in these repairs are warranted for 90 days when repaired by the Bogen Factory Service Department All shipping charges in addition to parts and labor charges will be at the owner s expense All returns require a Return Authorization number For most efficient warranty or repair service please include a description of the failure e608 BOGERI COMMUNICATIONS INC 50 Spring Street Ramsey NJ 07446 U S A Tel 201 934 8500 Fax 201 934 9832 www bogen com
4. speaker connections are done in the same manner 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 shields poor connections etc Keep input cables away from speaker cables and away from transformers and AC power lines Operation Power The power switch applies power to the amplifier it does not con trol any associated equipment which may be connected to the auxiliary power receptacle on the rear panel The POWER SWITCH illuminates when power has been applied to the unit Low Cut Filter Switch Caution To avoid electric shock be sure to disconnect AC Power Cord before removing the cover of the amplifier unit DO NOT perform any function requiring the removal of the cover of the amplifier unless you are qualified to do so The Low Cut Filter Switch designated SW1 is located next to the transformer socket on the printed circuit board and is accessible by removing the top cover of the amplifier The switch provides 10 dB attenuation at 100 Hz Input Level Control The input level control located on the rear panel adjusts the input signal applied to the amplifier Turn the adjustable screw clock wise to increase the level Warning 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 ob
5. 90 dB below rated output 4 ohms 8 ohms 25V 25VCT 70V Better than 2 dB from no load to full load Hi Z 50k ohms unbalanced Lo Z 600 ohms balanced or unbalanced and 1 1 bridging with optional plug in transformers 10 dB 100 Hz Front Panel Illuminated On Off power switch and overload shutdown LED Rear Panel Input level control Slo Blo fuse Internal Low Cut filter switch HTA125A 120V 60 Hz 3 1A 260 watts Full Rated Output Idle 45W HTA250A 120V 60 Hz 5 5A 520 watts Full Rated Output Idle 60W HTA125A 426 9 BTU hr HTA250A 939 2 BTU hr Electronic overload protection Electrical HTA125A 4A Slo Blo Fuse HTA250A 7A Slo Blo Fuse Thermal Thermostat Three wire grounded 300 watts maximum 19 W x 5 1 4 H x 11 D 48 3 x 13 3 x 27 9 cm 19 W x 5 1 4 H 48 3 x 13 3 cm Black HTA125A 44 lbs HTA250A 56 Ibs ETL listed Model TL600 600 ohm line matching transformer Model TL100 1 1 line matching transformer This receptacle will be grounded only if the power amplifier has been grounded properly Limited Warranty Exclusion of Certain Damages The Bogen HTA125A amp HTA250A Power Amplifiers are warranted to be free from defects in material and workmanship for two 2 years from the date of sale to the original purchaser Any part of the product covered by this warranty that with normal installation and use becomes defective as confirmed by Bogen upon inspection during the applicable w
6. UTION CAUTION TO PREVENT THE RISK OF ELECTRIC SHOCK DO NOT REMOVE ANY FRONT BACK COVERS RRd di0 OR PANELS NO USER SERVICEABLE PARTS INSIDE DO NOT OPEN REFER SERVICING TO QUALIFIED PERSONNEL The lightning flash with arrowhead symbol within an equi lateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclo sure that may be of sufficient magnitude to constitute a risk of electric shock to persons The exclamation point within an equilateral triangle is in tended to alert the user to the presence of important operating and maintenance servicing instructions Panel Diagrams FRONT PANEL HTA125A 250A D 2 O POWER MOS FET OVERLOAD AMPLIFIER SHUT DOWN 1 Overload Shut Down Indicator 2 ON OFF Power Switch REAR PANELS HTA125A HI Z INPUTS INPUT 4A 250V LEVEL SLO BLO RAMSEY N J MODEL HTA 125A 1 Power Cord 3 AC Line Fuses 6 Unbalanced Input Ground Pin Connected to Chassis 4 Output Connections 7 Input Level Adjustment 2 120V AC Outlet 5 Balanced Input Not Switched Accessory Transformer Required HTA250A QO g D 7A 250V CAUTION RAMSEY N J REPLACE FUSE WITH SAME TYPE AND RATING MODEL HTA 250A CLASS 2 WIRING ACCEPTABLE HI Z INPUTS Description The Bogen HTA125A and HTA250A Series Power Amplifiers are high performance units MOSFET technology delivers distor tion free power into reactive loads such a
7. arranty period will be repaired or replaced by Bogen at Bogen s option provided the product is shipped insured and prepaid to Bogen Factory Service Department 50 Spring Street Ramsey NJ 07446 USA Repaired or replacement product will be returned to you freight prepaid This warranty does not extend to any of our products that have been subjected to abuse misuse improper storage neglect accident improper installation or have been modified or repaired or altered in any manner whatsoever or where the serial number or date code has been removed or defaced THE FOREGOING LIMITED WARRANTY IS BOGEN S SOLE AND EXCLUSIVE WARRANTY AND THE PURCHASER S SOLE AND EXCLUSIVE REMEDY BOGEN MAKES NO OTHER WARRANTIES OF ANY KIND EITHER EXPRESS OR IMPLIED AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED AND EXCLUDED TO THE MAXIMUM EXTENT ALLOWABLE BY LAW Bogen s liability arising out of the manufacture sale or supplying of products or their use or disposition whether based upon warranty contract tort or otherwise shall be limited to the price of the product INNO EVENT SHALL BOGEN BE LIABLE FOR SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES INCLUDING BUT NOT LIMITED TO LOSS OF PROFITS LOSS OF DATA OR LOSS OF USE DAMAGES ARISING OUT OF THE MANUFACTURE SALE OR SUPPLYING OF PRODUCTS EVEN IF BOGEN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR LOSSES Some States do not allow the exclusion
8. ese instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean unit with dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 9 Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 10 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufacturer 12 Unplug this apparatus during lightning storms or when not used for long periods of time 13 Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped l D NO U R o N CA
9. l terminal strip for 4 ohm 8 ohm 25V 25VCT and 70V the 4 ohm output is com bined with the 25V tap on the HTA125A Class 2 wiring is ac ceptable for output loads Speaker Matching amp Power Distribution The HTA125A and HTA250A feature output connectors for 4 ohm 8 ohm 25V 25VCT and 70V speakers The amplifiers provide outputs for 25V and 70V speakers 70 volt speaker connections are made between the 70V and COM terminals on the output terminal strip The COM and GND terminals of the output terminal Input Connections Input from Another Amplifier The HTA125A HTA250A amplifiers may be driven from an amplifier that provides a 25V or 70V speaker output Connect the output of the driver amplifier to the HI Z INPUT jacks via a resistor network The resistors shown in Fig 1 are in addition to the normal loudspeaker load on the output of the driver amplifier a o OUTPUT TO HIGH TERMINAL IMPEDANCE STRIP OF INPUT OF DRIVER AMPLIFIER POWER AMPLIFIER AT 70V R1 10K 1 2W AT 25V R1 3 3K 1 2W Fig 1 Input From Another Amplifier Output Connections strip are connected using a shorting clip The shorting clip enables the amplifier output to act as an unbalanced output one side of the output connected to ground If desired the output can be made to be a balanced output with no connection to ground To balance the output simply remove the shorting clip All speaker connections remain the same as above 25V
10. rotected to prevent damage due to ex cessive temperatures The unique self protecting output stage pre vents thermal runaway which is often encountered in conventional amplifiers Electric shutdown circuitry is activated if an overload or short oc curs and a front panel OVERLOAD SHUTDOWN LED illuminates Once the cause has been rectified the unit automatically resets The power ON OFF switch located on the front panel illuminates when power is ON The rear panel contains an Input Level control Input and Output connections AC Line Fuse and an Auxiliary Re ceptacle A Low Cut Filter switch is located internally on the printed circuit board Power and Grounding The AC line cord has a 3 prong plug which should be plugged into a 3 wire grounded 120V AC and 60 Hz outlet It is important to ground the amplifier Auxiliary Power Receptable Caution The front panel ON OFF switch does not control the auxiliary receptacle The auxiliary power receptacle on the rear panel is a 3 wire grounded outlet and may be used to supply power to accessory equipment in the sound system Ensure that the accessory equip ment does not require more than 300 watts Equipment connected to the auxiliary receptacle with a 3 prong line cord will be grounded providing the amplifier line cord has been properly grounded High Impedance Input Ahigh impedance input is provided by two RCA type jacks An input signal of 500mV is required for full rated output
11. s high performance loudspeakers or transformers The HTA125A supplies 125 watts HTA250A supplies 250 watts continuous RMS output at less than 0 5 total harmonic distor tion with a frequency response of 1 dB from 20 Hz to 20 kHz An input signal of only 500mV is required for full rated output 150mV for low impedance balanced input with Model TL600 ac cessory transformer Input impedances are high impedance un balanced and low impedance balanced with TL600 accessory transformer Outputs include 4 ohm 8 ohm 25V combined with 4 ohm output in HTA125A 25VCT and 70V Line bridging may be achieved with Bogen s TL100 accessory transformer Installation Rack Mounted Installation The amplifier is designed for installation in a standard 19 equip ment rack Position the unit in the rack and secure with screws through the amplifier front panel NOTE Before placing the amplifier in a rack install any accessory transformers required Ventilation The amplifier generates heat during operation It must be prop erly ventilated to prevent excessive temperature rise If other heat producing equipment or several amplifiers have been installed in an enclosed rack or cabinet you must ensure that there is space above and below the amplifier s to allow for passive cooling It is recommended that the amplifier be installed on the bottom of a rack or above any equipment that does not produce heat The amplifiers are thermally p
12. tain the desired output level Overload Shutdown Indicator Electronic shutdown circuitry activates whenever an overload or short occurs on the output of the amplifier The front panel OVER LOAD SHUTDOWN LED illuminates indicating the discontinua tion of power output once the cause has been determined and rectified the unit automatically resets Thermal Cut Out The amplifier is protected by a thermal cut out which should not trip under normal conditions If it trips check for inadequate ven tilation of the unit or overloading The cut out will automatically reset after cooling AC Line Fuse Replace the fuse only with same type rating If a second fuse blows do not make any attempt to operate the unit Consult the Bogen Service Department or an authorized service agency Rated Output Power Total Harmonic Distortion Frequency Response Input Sensitivity Hum and Noise Outputs Output Regulation Input Impedances Low Cut Filter Controls amp Indicators Power Requirements Thermal Emissions full power Overload Protection Auxiliary Receptacle not switched Dimensions without removable feet Front Panel Dimensions Finish Shipping Weight Regulatory Approvals Accessories Technical Specifications HTA125A 125W HTA250A 250W Less than 0 5 20 to 20 000 Hz at full rated output 1 dB 20 to 20 000 Hz at full rated output Hi Z 500mV Lo Z balanced with optional transformer 150mV
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