User manual B&K ST2140

[. . . ] Do not stack anything on top of the amplifier (preamplifier, processor, source. . . etc. ). Leave at least 2-3 inches clearance from the top of the amplifier to the next shelf, component, etc. , to ensure proper ventilation. * If you are at all unsure of what the speaker `ratings' are, contact your dealer. Page 2 12998 rev 0004 The ST2140's purpose and function The ST2140 is a compact, very efficient, two channel power amplifier. It is designed to be used in all types of audio or audio/video systems. Design and construction The ST2140 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 include state-of-the-art solid state devices, 1% metal film resistors, computer grade electrolytic power supply capacitors, and a high capacity toroidal transformer. [. . . ] @ CTRL IN Signal Signal No Signal No Signal Button position OUT IN OUT IN Output status Sound Sound Mute Sound @ CTRL OUT Signal Signal No Signal Signal *Note: The control voltage is for muting control only. Each amplifier must be connected to its own source of AC power in order for it to operate. Level controls The level controls are an option that can be added to the amplifier. If your amplifier has this option, the balanced inputs are not present. You can not have level controls and balanced inputs on an amplifier. There are two level controls on the back of the amplifier. When using the level controls, first start with them turned all the way up (clockwise). Then adjust them according to your system requirements to match the sound level coming from each speaker. )LJXUH& Page 6 12998 rev 0004 Outputs Five way binding posts are provided. They are designed to accept a banana-type plug or spade lug connector (shown below) and are color coded for easy identification. The red (+) post should always be connected to the speakers (+) jack. The black (-) post should always be connected to the speakers (-) jack. Spade connector Banana jack Here is a typical amplifier setup: )LJXUH' Inputs Unbalanced - RCA type connectors accept line input from the preamplifier's unbalanced output connectors. There are two input connectors, one for each channel, that may be used to connect the amplifier to the preamplifier. RCA cable connector - Operation - For unbalanced operation, ensure the balanced switch between the balanced inputs on the rear of the amplifier is in the `off' (out) position. If the amplifier does not have balanced inputs then it is always in unbalanced mode. Page 7 12998 rev 0004 Inputs Balanced XLR type connectors accept line input from the preamplifier's balanced output connectors. There are two input connectors, one for each channel, that may be used to connect the amplifier to the preamplifier. Balanced cable connector - Operation - For balanced operation, ensure the balanced switch between the balanced inputs on the rear of the amplifier is in the `on' (in) position. NOTE: If the amplifier is equipped with level controls, the balanced inputs will not be present. Here is a typical input setup: Page 8 12998 rev 0004 System installation There will most likely be a number of cables involved in the installation of your home entertainment system. Pre-planning 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, etc. . . ). For the sake of safety, 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. [. . . ] 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. Should you find it necessary to return equipment to B&K, for any reason, a RETURN AUTHORIZATION (RA) number must be issued by B&K in respect of the equipment being returned. You may request an RA number by calling B&K at the numbers below. We ask that you provide the following information at that time. [. . . ]