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B&K series II manual

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Table of contents for the manual

  • Page 1

    Reference 7270 series II Seven Channel Amplifier OWNER’S MANUAL B & K Components Ltd. P/N 13009 Rev.0102[...]

  • Page 2

    B&K Components, Ltd 2100 Old Union Road Buffalo, New York 14227 P/N 13009 Rev.0102[...]

  • Page 3

    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 pag[...]

  • Page 4

    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 suffici[...]

  • Page 5

    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, transpa[...]

  • Page 6

    Rear Panel View 1. AC fuse holder 4. Amplifier control muting input/output 2. AC Input receptacle 5. Level controls 3. Speaker outputs 6. Inputs 7. Speaker fuses REAR PANEL DESCRIPTION 1. AC fuse holder - Holds the AC Line fuse. This fuse is a 15 Amp / 250 Volt Slow Blow fuse. Replace only with the same type and value fuse. 2. AC Input receptacle -[...]

  • Page 7

    LEVEL CONTROLS 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 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 matche[...]

  • Page 8

    Here is a typical preamplifier to amplifier setup: OUTPUTS Five way binding posts are provided. There is one pair provided for each channel. They are designed to accept a banana-type plug, spade-lug connector (shown below), terminal posts, and bare wire, and they are color coded for easy identification. The positive (+) post should always be connec[...]

  • Page 9

    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[...]

  • Page 10

    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 eliminat[...]

  • Page 11

    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 o[...]

  • Page 12

    TROUBLESHOOTING 1. Replace blown rail fuse inside amplifier 1. Blown rail fuse Channel sounds distorted and low in output 1. Check all connectors and repair as necessary. 1. Poor g round connection in inter- connect cables. Loud hum or buzz on one or more channels 1. Check connections makin g sure that cables are connected (+) to (+) and (-) to (-)[...]

  • Page 13

    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 / µ sec Dynamic headroom 1.2 dB S/N (A-weighted) 95 dB Voltage gai[...]

  • Page 14

    LIMITED WARRANTY B&K Components Ltd., referred to herein as B&K, warrants your B&K equipment a g ainst all defects in material and workmanship for a period of five years from the date of purchase. This warranty applies only to the ori g inal purchaser and only to equipment in normal residential use and service. Defective equipment must [...]

  • Page 15

    B&K Components, Ltd 2100 Old Union Road Buffalo, New York 14227 P/N 13009 Rev.0102[...]

  • Page 16

    B&K Components, Ltd. 2100 Old Union Road Buffalo, New York 14227 www.bkcomp.com P/N 1 300 9 Rev. 0 102[...]