User manual B&K REFERENCE 7270 II

[. . . ] Leave at least 2-3 inches clearance from the top of the amplifier to the next shelf, component, etc. , to insure proper ventilation. * If you are at all unsure of what the speaker `ratings' are, contact your dealer. y y y y y Page 2 P/N 13009 Rev. 0102 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 resistors, computer grade electrolytic power supply capacitors, and a high capacity toroidal transformer. The Reference 7270 series II operates with a class A predriver and AB high current MOSFET power output stages. [. . . ] 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. 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. 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. 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. This will provide you with the ideal cable length. Page 7 P/N 13009 Rev. 0102 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. [. . . ] This warranty does not apply to the cabinet, the remote controller, or appearance items such as the faceplate, control buttons, or display lenses, nor does it cover any expenses incurred in shipping the unit to and from the manufacturer's service depot. No warranty, implied or otherwise created by State law shall extend beyond the terms of this warranty and B&K shall not be liable for any incidental or consequential damage arising out of a defect in material or workmanship of the unit during the terms of this warranty or thereafter. Some States do not allow the exclusion or limitation of incidental or consequential damages and the foregoing exclusions may not apply to you. No agent, representative, dealer or employee of B&K has the authority to increase or alter the obligations or terms of this warranty. B&K Components Ltd. RETURNING EQUIPMENT No equipment may be returned to B&K Components Ltd. [. . . ]