User manual B&K REFERENCE 7270 II

[. . . ] Reference 7270 series II Seven Channel Amplifier OWNER'S MANUAL B & K Components Ltd. P/N 13009 Rev. 0102 B&K Components, Ltd 2100 Old Union Road Buffalo, New York 14227 P/N 13009 Rev. 0102 TABLE OF CONTENTS Safety Precautions Purpose and function Design and construction Features Rear panel view Rear panel description Level controls Inputs Outputs System installation Making the connection Control Muting Troubleshooting Care and cleaning Specifications Warranty Accessories included: Manual and Power cord page 2 page 3 page 3 page 3 page 4 page 4 page 5 page 5 - 6 page 6 page 7 page 8 page 9 page 10 page 10 page 11 page 12 Page 1 P/N 13009 Rev. 0102 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 presence of important operating and maintenance (servicing) instructions in the literature accompanying the unit. y Observance of polarity is essential. Double-check connections before turning the amplifier on. The amplifier can be damaged if the unit is connected when its polarities are incorrect. [. . . ] A 97dB speaker may sound louder than a 93 dB speaker at a given volume level. The level control for a 93 dB speaker would be set at a relative level that is higher than a 97 dB speaker to match their audio volume levels. Turning the level control knob clockwise will increase the relative output volume of the speaker. Turning the level control knob counter clockwise will decrease the relative output volume of the speaker. INPUTS RCA type connectors accept line inputs from the preamplifier's output connectors. There are seven input connectors, one for each channel, that may be used to connect the amplifier to the preamplifier. RCA cable connector Page 5 P/N 13009 Rev. 0102 Here is a typical preamplifier to amplifier setup: 8 =?DC B ;4 E4 ; 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; & ;> 78 ;> 78 ;> 78 ;> 78 ;> 78 ;> 78 ;> 78 8= ?D C 8= ?D C ! 8= ?D C " 8= ?D C # 8= ?D C $ 8= ?D C % 8= ?D C & 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 connected to the speakers (+) jack. The negative (-) post should always be connected to the speakers (-) jack. Here is a typical amplifier output setup: 27 0= =4 ; > DC ?; DB SB L SR SB L SL From Rear Left O utput L From Front Left O utput C From Center Output R From Front Right O utput From Rear Right O utput Fro m Surr Back Right O utput Fro m Surr Back Left O utput < 8= D B OUTPUTS Spade connector Banana jack 27 0= =4 ; ! > DC ?; DB < 8= D B 20 DC8 >= Page 6 P/N 13009 Rev. 0102 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 reference. Cable runs are critical in that they must be kept away from sources of power radiation (amplifiers, power cords, heaters, appliances, etc). For safety reasons, they should also be kept out of traffic areas. The process of optimizing the system will include the type of cable, the length of the run, and the obstructions it must deal with along its run. Your dealer can advise you on the products available and their relative merits. If building custom length audio cables is not your strength, your dealer should be able to help you with that as well. When possible, use a separate AC power line for the amplifier, one that is not shared by any other household component. THIS IS VERY IMPORTANT!!! Tip: Take a piece of string (longer than the longest cable run) and mark it at each foot of length. Then do a mock cable run using the string, dressing it neatly along the way. Count the divisions to the next full foot, and add one foot to allow for some movement of the components. [. . . ] Over time you may wish to clean the exterior of the unit by wiping it with a damp cloth to remove any dirt or dust that accumulates on it. Unplug the amplifier and be sure that it has completely powered down before you apply any damp cloth. Do not let any liquid enter the amplifier through the vents in the top cover. REMEMBER, LIQUIDS CONDUCT ELECTRICITY!!! [. . . ]