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Reference 7270
series II
Seven Channel Amplifier
OWNER’S MANUAL
B & K Components Ltd.
P/N 13009 Rev.0102
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B&K Components, Ltd 2100 Old Union Road Buffalo, New York 14227 P/N 13009 Rev.0102
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TABLE OF CONTENTS Safety Precautions page 2 Purpose and function page 3 Design and construction page 3 Features page 3 Rear panel view page 4 Rear panel description page 4 Level controls page 5 Inputs page 5 - 6 Outputs page 6 System installation page 7 Making the connection page 8 Control Muting page 9 Troubleshooting page 10 Care and cleaning page 10 Specifications page 11 Warranty page 12 Accessories included: Manual and Power cord Page 1 P/N 13009 Rev.0102
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SAFETY PRECAUTIONS PLEASE READ BEFORE INSTALLING WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. The lightning flash with an arrowhead, within an equilateral triangle, is intended to alert the user of the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of a sufficient magnitude to constitute a risk of electric shock to you. The exclamation point within an equilateral triangle is intended to alert the user of the prese
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THE REFERENCE 7270 SERIES II PURPOSE AND FUNCTION The Reference 7270 series II is a high current, seven channel power amplifier. It is designed to be used in all types of audio or audio/video systems. DESIGN AND CONSTRUCTION The Reference 7270 series II utilizes high quality electronic circuitry to achieve an environment wherein a detailed, transparent, and highly musical sound can be realized. The high quality parts complement includes; state-of-the-art solid state devices, 1% metal film resis
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Rear Panel View 5 4 2> =C A>; 8 > 8 = ? D CB ; 4 E4; 2 > = CA> ;B ; 4E4 ; ; 4E4 ; ! ; 4E4 ; " ; 4E4 ; # ; 4E4 ; $ ; 4E4 ; % ; 4E4 ; & :6 ( < ,03 / 2 81’6 (57 7( % ;> 78 ;> 78 ;> 78 ;> 78 ;> 78 ;> 78 ;> 78 6 C5B > ? 8= ? D C 8= ? D C ! 8= ? D C " 8= ? D C # 8= ? D C $ 8= ? D C % 8= ? D C & 5D B 4 5D B 4 5D B 4 5D B 4 5D B 4 5D B 4 5D B 4 5D5D BB 44 3 1ED9 ? > * 6 ?B 3 ? > D9>E 54 @B ? D 5 3 D 9? > 1 7 1 9>C D B 9C ; ?6 69 B 5 B 5@< 1 3 5 ?>< I G 9D8 C1 = 5 DI @5 !%1 "% F 7 27 0= =4 ; 2
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LEVEL CONTROLS /8&$ 6),/0 THX certified units are denoted by the THX Ultra logo on the faceplate of the unit. For use in THX reference theater system, the level controls must 5 be set to the full clockwise position (highest possible level). Generally in a home theater application, the level controls on the rear will not be used. All of the levels will be matched through the surround processor. In a system that uses the Reference 7270 series II for other applications, adjustment of level controls
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From Surr Back Right SBL Output From Rear SR Right Output From Front R Right Output From Center C Output From Front L Left Output From Rear SL Left Output From Surr SBL Back Left Output Here is a typical preamplifier to amplifier setup: 8 = ? D C B ; 4 E 4 ; 2>=C A > ; B ;4 E 4 ; ;4 E 4 ; ! ;4 E 4 ; " ;4 E 4 ; # ;4 E 4 ; $ ;4 E 4 ; % ;4 E 4 ; & ;> 7 8 ;> 7 8 ;> 7 8 ;> 7 8 ;> 7 8 ;> 7 8 ;> 7 8 8= ?D C 8= ?D C ! 8= ?D C " 8= ?D C # 8= ?D C $ 8= ?D C % 8= ?D C & OUTPUTS Five way binding posts are
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SYSTEM INSTALLATION There will most likely be a number of cables involved in the installation of your home entertainment system. Preplanning is essential in order to maximize system efficiency. We recommend the following as a means of helping you reach that goal: Make a diagram of your proposed system by laying out the relative location of each component in the system. Then lay out the proposed cable runs between them. Number each cable and record its length on the diagram for future referenc
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MAKING THE CONNECTION Before doing anything, insure that the power switch on the amplifier’s front panel is in the ‘off’ position. Again, it is recommended that you locate a separate AC power outlet for the amplifier, one that is not shared by any other audio component in the system or any other household component. This will eliminate the possibility of the amplifier ‘modulating’ the power being supplied to the component and compromising the signal originating from that component. Locate
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CONTROL MUTING A control is used to “trigger” various outboard amplifiers, projectors, or other accessories by sending a specified voltage when a certain mode or source is selected from the source of the control voltage “trigger”. A control system is provided on each Reference 7270 series II amplifier to allow remote switching of the mute on/off feature. A preamplifier’s control output, such as what is provided with B&K series preamplifiers, can be utilized to provide a control signal to the Ref
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TROUBLESHOOTING PROBLEM POSSIBLE CAUSE POSSIBLE SOLUTION No sound 1. Power cord not plugged in 1. Reconnect power cord (‘on’ LED not illuminated) 2. Power off at AC source 2. Check AC switch or fuse 3. AC power inlet fuse blown or 3. Check for shorts or faulty overloading 4. Control Input not activated. 4. Supply Control IN with a 5-24 Volt supply. (Page 5) No sound on some or all 1. Speaker leads
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REFERENCE 7270 SERIES II SPECIFICATIONS Power rating: 8 ohms 200 watts @ 1 kHz 4 ohms 375 watts @ 1 kHz Frequency response 5 Hz - 45 kHz Input sensitivity 1.4 Volts THD (S+N) 0.09 % @ 1 kHz Input impedance 33.2 k ohms Damping factor 450 Current (peak to peak) 75 Amps Slew rate 14 V / μsec Dynamic headroom 1.2 dB S/N (A-weighted) 95 dB Voltage gain 28 Line voltage 120/220/240 VAC switchable Dimensions (O.A.)
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LIMITED WARRANTY B&K Components Ltd., referred to herein as B&K, warrants your B&K equipment against all defects in material and workmanship for a period of five years from the date of purchase. This warranty applies only to the original purchaser and only to equipment in normal residential use and service. Defective equipment must be returned to B&K, prepaid, accompanied by sufficient payment to cover the cost of return shipping and handling, and will be repaired or replaced at the discretion o
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B&K Components, Ltd 2100 Old Union Road Buffalo, New York 14227 P/N 13009 Rev.0102
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B&K Components, Ltd. 2100 Old Union Road Buffalo, New York 14227 www.bkcomp.com P/N 13009 Rev.0102
